Mars Rover Curiosity Completes First Full Drill

For the first time in history, humans have drilled a hole into rock on Mars and are collecting the powdered results for analysis, NASA announced Saturday.

After weeks of intensive planning, the Mars rover Curiosity undertook its first full drill on Friday, with NASA receiving images on Saturday showing that the procedure was a success.

Curiosity drilled a hole that is a modest 2.5 inches (6.35 centimeters) deep and .6 inches (1.52 centimeters) wide but that holds the promise of potentially great discoveries. (Watch video of the Mars rover Curiosity.)

"The most advanced planetary robot ever designed now is a fully operating analytical laboratory on Mars," John Grunsfeld, NASA associate administrator for the agency's Science Mission Directorate, said in a statement on Saturday.

"This is the biggest milestone accomplishment for the Curiosity team since the sky-crane landing last August."

Read: Asteroid to Make Closest Flyby in History

The site of the much-anticipated penetration is a flat section of Mars rock that shows signs of having been underwater in its past.

Called Yellowknife Bay, it's the kind of environment where organic materials—the building block of life—might have been deposited and preserved long ago, at a time when Mars was far wetter and warmer than it is today.

The contents of the drilling are now being transferred into the rover's internal collection system, where the samples will be sieved down to size and scoured to minimize the presence of contamination from Earth. (Watch video of Curiosity's "Seven Minutes of Terror.")

Then the sample will be distributed to the two instruments most capable of determining what the rocks contain.

The first is the Sample Analysis on Mars (SAM), which has two ovens that can heat the powdered rock to almost 2000°F (1093°C) and release the rock's elements and compounds in a gaseous form.

The gases will then be analyzed by instruments that can identify precisely what they are, and when they might have been deposited. Scientists are looking for carbon-based organics believed to be essential for any potentially past life on Mars.

Powder will also go to the Chemistry and Mineralogy (CheMin) instrument for a related analysis that looks especially at the presence of minerals—especially those that can only be formed in the presence of water.

Louise Jandura, chief engineer for Curiosity's sample system at NASA's Jet Propulsion Laboratory, said that designing and testing a drill that can grab hold of Martian rock and commence first a percussive shallow drilling and then dig a deeper hole was difficult.

The drill, which is at the end of a 7-foot arm, is capable of about 100 discrete maneuvers.

"To get to the point of making this hole in a rock on Mars, we made eight drills and bored more than 1,200 holes in 20 types of rock on Earth," Jandura said in a statement.

Results from the SAM and CheMin analyses are not expected for several days to weeks.

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LAPD Reopens Case of Suspected Cop-Killer's Firing

The Los Angeles Police Department announced today it will reopen the case of the firing of Christopher Dorner, but said the decision was not made to "appease" the fugitive former cop suspected of killing three people.

Dorner, a fired and disgruntled former Los Angeles police officer, said in the so-called "manifesto" he released that he was targeting LAPD officials and their families and will keep killing until the truth is known about his case.

"I have no doubt that the law enforcement community will bring to an end the reign of terror perpetrated on our region by Christopher Jordan Dorner and he will be held accountable for his evil actions," LAPD Chief Charlie Beck said in a statement released tonight.

He spoke of the "tremendous strides" the LAPD has made in regaining public trust after numerous scandals, but added: "I am aware of the ghosts of the LAPD's past and one of my biggest concerns is that they will be resurrected by Dorner's allegations of racism within the Department."

To do that, he said, full re-investigation of the case that led to Dorner's firing is necessary.

"I feel we need to also publicly address Dorner's allegations regarding his termination of employment, and to do so I have directed our Professionals Standards Bureau and my Special Assistant for Constitutional Policing to completely review the Dorner complaint of 2007; To include a re-examination of all evidence and a re-interview of witnesses," he said. "We will also investigate any allegations made in his manifesto which were not included in his original complaint.

Irvine Police Department/AP Photo

Christopher Dorner Search: Officials Search for Ex-officer in the Mountains Watch Video

Hundreds of Officers on Hunt for Alleged Cop Killer Watch Video

"I do this not to appease a murderer. I do it to reassure the public that their police department is transparent and fair in all the things we do."

PHOTOS: Former LAPD Officer Suspected in Shootings

As police searched for Dorner today in the San Bernardino Mountains, sources told ABC News that investigators found two AR-15 assault rifles in the burned-out truck Dorner abandoned.

The truck had a broken axle, which may be the reason he decided to set fire to it, the police sources said.

A man identifying himself as Dorner taunted the father of Monica Quan four days after the former LAPD officer allegedly killed her and just 11 hours after he allegedly killed a police officer in Riverside, Calif., according to court documents obtained by ABC News

A man claiming to be Dorner called Randall Quan and told him that that he "should have done a better job of protecting his daughter," according to the documents.

In his 6,000-word "manifesto," Dorner named Randal Quan, a retired LAPD captain and attorney who represented him before a police review board that led to Dorner's dismissal from the force.

"I never had an opportunity to have a family of my own, I'm terminating yours," Dorner wrote, and directed Quan and other officials to "[l]ook your wives/husbands and surviving children directly in the face and tell them the truth as to why your children are dead."

Monica Quan and her fiancé Keith Lawrence were gunned down last Sunday in their car in the parking of their Irvine, Calif., condominium complex. Both were struck with multiple gunshot wounds.

The call, according to court records, was traced to Vancouver, Wash., but law enforcement officials do not believe Dorner was there at the time at the call.

Dorner is believed to have made the call early Thursday afternoon, less than half a day after he is suspected of killing a police officer and wounding two others early that morning, sparking an unprecedented man hunt involving more than a thousand police officers and federal agents spanning hundreds of miles.

FULL COVERAGE: Christopher Jordan Dorner

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India holds showcase to raise awareness on natural heritage

NEW DELHI: New Delhi is known as a cultural hub, where fairs and festivals of all kinds are held nearly every day.

One such recent event had a special theme: raising awareness of the country's natural heritage.

The 15-day "Green Haat" saw participants from across India showcase a variety of non-timbre forest produce.

Goods on display ranged from wild grains, chillies and spices to medicinal plants, herbal preparations, and honey. Also on display were furniture and accessories made from bamboo and other wild plants.

One of the aims of this initiative, launched by the Ministry of Environment and Forests, was to highlight the traditional knowledge of India's forest communities.

A participant of "Green Haat", only known as Bobby, said: "It's important because the things you get from the hills and jungles aren't available in the cities. Things from the jungles are pure, there's nothing like it in the cities."

Another goal of "Green Haat" was demonstrating how preserving biodiversity could be an important economic activity.

A participant noted that a plant that stops soil erosion in the hilly areas could also be used as a source of fibre to make unique accessories.

Participant Sandip Khandwal said: "Since we found that there are possibilities in making other products from this fibre, Rambans fibre, we started designing and making sheets of this fibre, and then we made bags, folders, caps... clutches also."

For many, the fair was an eye-opener to India's natural heritage.

Some said they did not know enough about the variety of produce that could be sourced from forests, and were glad to learn from those who did.

Anu Kamran, a visitor, said: "(A participant) told me about some plants, which are very beneficial for the heart, and which are also very beneficial for cough and cold, which we can grow in our house, and in our kitchen garden, or even in our pots."

Participants were happy there was a high level of interest in and appreciation for their products.

Bobby said: "A lot of people have come, and we have received a lot of support from them. Many said that what we are doing is a good thing, and the things we were showing them were very nice."

Visitors to the fair were also treated to dramatic presentations on environmental themes, like a street play presented by a group of schoolchildren.

Both visitors and participants have pointed out the importance of fairs like "Green Haat", which bring a side of India not often seen to the heart of the capital city.

- CNA/xq

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Afzal's family communicated through speed post: Home secretary

NEW DELHI: The family of Parliament attack convict Afzal Guru has been informed about his hanging by the Tihar authorities through speed post and the J&K government was taken into confidence before his execution, the Centre said on Saturday.

"They (Tihar jail authorities) intimated the family through speed post, registered post and the DG (Director General of Jammu and Kashmir Police) has been told to check with the family whether they got it or not," Union home secretary RK Singh told reporters.

Singh said the J&K government has been taken into confidence before Guru's hanging early Saturday.

In the wake of Afzal Guru's hanging, the Jammu and Kashmir government is taking all necessary preventive measures to maintain peace there but the government is not apprehending any trouble in rest of the country.

"We are not having any apprehension anywhere in the country. In Jammu and Kashmir, the state government is taking steps. We are in touch with them," the home secretary said.

Without giving details, Singh said security has been intensified in some areas.

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Space Pictures This Week: Sun Dragon, Celestial Seagull

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  Solar Dragon

  Image courtesy SDO/NASA

  Resembling a dragon's tail, remnants of a solar filament strain to escape the sun's gravity in an image released this week by NASA's Solar Dynamics Observatory.

  Most of the electrically charged gas, imaged in extreme ultraviolet light, was unsuccessful in its escape attempt and fell back into the sun.

  Filaments form when magnetic field lines push out of the sun in loops, holding dense gas above the surface of the sun. (Read about a huge solar filament that erupted in August 2012.)

  —Jane J. Lee and Christine Dell'Amore

  Published February 8, 2013

  
  











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  Aurora On The Road

  Photograph by Marcel Mivelaz, My Shot

  Northern lights writhe behind a thin cloud layer above a road on Ringvassoya Island, Norway, in this picture submitted to National Geographic's My Shot photography community on January 31.

  Born of violent eruptions of plasma from the sun's surface, auroras occur when the ejected gas slams into the protective bubble of Earth's magnetic field. (Watch a video about the birth of auroras.)

  Published February 8, 2013

  
  











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  Celestial Seagull

  Image courtesy ESO

  Like a parrot perched on a pirate's arm, the Seagull Nebula resides in one of the spiral arms of the Milky Way.

  This new image, released by the European Southern Observatory on February 6, shows a closeup of one of the "wings" of the Seagull Nebula. Red clouds of hydrogen gas glow from the intense ultraviolet radiation given off with the birth of stars.

  The entire nebula is actually comprised of three large gas clouds arranged in the shape of a bird. (See pictures of other nebulae.)

  Published February 8, 2013

  
  











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  Saturn's North Pole

  Image courtesy Caltech/SSI/NASA

  Saturn's hexagon-shaped north pole is lit by the sun now that spring has come to the planet's northern hemisphere, as seen in a NASA picture released this week.

  The 15,000-mile-wide (25,000-kilometer-wide) cloud formation, captured by the Cassini spacecraft's wide-angle camera in November, was initially spied during the Voyager missions in the 1980s. (See another Cassini picture of the hexagon.)

  Published February 8, 2013

  
  











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  Martian Avalanches

  Image courtesy U. Arizona/NASA

  A 2011 frost avalanche kicks up dust on Mars in a picture released this week by Mars Reconnaissance Orbiter's HiRISE camera team.

  Frost avalanches usually occur at the onset of the Martian spring, when layers of carbon dioxide frost warm, causing ice and dust to cascade off of cliffs.

  "While HiRISE has captured other frost avalanches before, they never cease to amaze, since it demonstrates that there are indeed active processes on the red planet," according to the HiRISE website. (Related: "First Mars Avalanches Seen In Action.")

  Published February 8, 2013

  
  











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  Luminous London

  Photograph courtesy NASA

  London gleams in a nighttime picture taken from the International Space Station on February 2.

  Expedition 34 Flight Engineer Chris Hadfield captured the English city while flying about 240 miles (400 kilometers) above Earth.

  Published February 8, 2013

  
  











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  Illustration courtesy Foster and Partners/ESA

  Published February 8, 2013

  
  

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Great Energy Challenge Blog

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Northeast Shuts Down as Blizzard Batters Millions

A blizzard of possibly historic proportions battered the Northeast Friday into Saturday, and forecasters feared as much as two feet of snow and strong winds could shut down densely populated cities such as New York and Boston, where cars were ordered off the streets.

State officials declared states of emergencies throughout the region, and utilities estimated more than a half-million customers were without power by late Friday night.

Some wondered if the storm could top Boston's all-time single-storm snowfall record of 27.6 inches, set in 2003.

By 9 p.m. Friday, according to the National Weather Service, the storm was spinning off the coast of Long Island, N.Y., and expected to move north-northeastward past New England's coast before its effects tapered off on Saturday afternoon.

"Storm total snowfall accumulations of 1 to 2 feet ... with locally higher amounts are possible across much of the Northeast," the National Weather Service said. "The heaviest snow is forecast to fall across parts of eastern Massachusetts ... Connecticut and Rhode Island where snowfall amounts higher than two feet are possible. In addition to the heavy snowfall ... wind gusts as high as 70 mph are possible ... especially near the coasts."

By 9 p.m. Friday, parts of Connecticut and New York had the highest actual snowfall totals listed by the National Weather Service, with 13 inches measured in Ogdensburg and East Setaukey, N.Y., and Lisbon and North Branford, Conn.

Peak wind gusts included a 71-mph measurement in Buzzards Bay, Mass., the National Weather Service said.

Power outages also were reported across the region. As of 11 p.m. Friday, for instance, approximately 300,000 Massachusetts customers were without power, ABC News station WCVB reported. Utilities also reported approximately 170,000 without power in Rhode Island, 30,000 in Connecticut and nearly 20,000 in New York.

The blizzard conditions came together after a storm from the west joined forces with one from the south to form a nor'easter.

Hurricane Sandy Victims Hit Again, Survivors Prepare for Worst Watch Video

Weather Forecast: Blizzard Headed for Northeast Watch Video

The storm showed the potential for such ferocity that, before it even hit with full force, Massachusetts Gov. Deval Patrick declared a state of emergency Friday afternoon and signed an executive order banning vehicular traffic on roads in his state effective at 4 p.m. ET. It was believed that the last time the state enacted such a ban was during the blizzard of 1978. Violating the ban could result in a penalty of up to a year in jail and a $500 fine.

"[It] could definitely be a historic winter storm for the Northeast," said Adrienne Leptich of the National Weather Service in Upton, N.Y. "We're looking at very strong wind and heavy snow and we're also looking for some coastal flooding."

Airlines began shutting down operations Friday afternoon at major airports in the New York area as well as in Boston, Portland, Maine, Providence, R.I., and other Northeastern airports. By early evening Friday, more than 4,300 flights had been cancelled on Friday and Saturday, according to FlightAware. Airlines hoped to resume flights by Saturday afternoon, though normal schedules were not expected until Sunday.

The snow fell heavily Friday afternoon in New York City. Mayor Michael Bloomberg said clearing the roads was his main concern, and the city readied 1,700 snow plows and 250,000 tons of salt to clear the streets.

New York City was expecting up to 14 inches of snow, which started falling early this morning, though the heaviest amounts were expected to fall at night and into Saturday. Wind gusts of 55 mph were expected in New York City.

"Stay off the city streets. Stay out of your cars and stay at home while the worst of the storm is on us," Bloomberg said Friday.

Connecticut Gov. Dannel P. Malloy declared a state of emergency, deploying National Guard troops across the state to assist in rescues and other emergencies. Schools and state courthouses were closed, and all flights after 1:30 p.m. at Bradley Airport, north of Hartford, Conn., were cancelled. The state's largest utility companies planned for the possibility that 30 percent of customers -- more than 400,000 homes and businesses -- would lose power.

Malloy also directed drivers to stay off the state's major highways.

"Please stay off of 95, 91, 84, Merritt Parkway and any other limited-access road in the state," he said Friday evening.

PHOTOS: Northeast Braces for Snowstorm

Boston, Providence, R.I., Hartford, Conn., and other New England cities canceled school today.

"Stay off the streets of our city. Basically, stay home," Boston Mayor Tom Menino warned Thursday.

On Friday, Menino applauded the public's response.

"I'm very pleased with the compliance with the snow emergency," he said. "You drive down some of the roadways, you don't see one car."

Friday evening, Gov. Patrick also applauded the public's cooperation with the statewide vehicle ban, noting the clear roads were helping utility crews get their work done.

"It's been a great, great help and I thank everyone," Patrick said. "I know it's been an imposition."

As of 4:30 p.m. Friday, according to the Department of Defense, 837 National Guard soldiers and airmen under state control had been activated in Connecticut, Massachusetts and New York in anticipation of the storm -- 552 in Massachusetts, 235 in Connecticut and 50 in New York. The extra hands were helping with roadways, transportation, making wellness checks on residents and other emergency services.

Beach erosion and coastal flooding was possible from New Jersey to Long Island, N.Y., and into New England coastal areas. It was feared some waves off the coast could reach more than 20 feet.

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Lawmakers divided on Postal Service plan

Lawmakers wrestled Thursday with how to address Postmaster General Patrick R. Donahoe’s announcement that the U.S. Postal Service plans to end Saturday mail delivery in August.

Donahoe moved to circumvent Congress’s long-standing resistance to the proposal for five-day delivery, a move the Postal Service thinks will save about $2 billion annually and help ease its financial losses. The agency lost $15.9 billion in the last fiscal year.

The postmaster took advantage of legislators’ own dysfunction over budget matters this week, gambling that lawmakers will not thwart his plan after Congress’s temporary spending measure expires March 27.

The spending plan includes language requiring six-day delivery, but lawmakers have not said whether they will insist on the language in the next spending bill.

It appeared Thursday that the issue was shaping up among lawmakers like the discussions over the automatic spending cuts, known as sequestration, which are set to kick in March 1.

Legislators questioned the legality of Donahoe’s plan and pointed fingers over Congress’s inability last year to achieve comprehensive postal reform, but none outlined a strategy to prevent the Postal Service’s effort.

Senate Majority Leader Harry M. Reid (D-Nev.) said in a statement Thursday that such a drastic policy move requires congressional approval.

“The Postmaster General relied on flawed legal guidance to claim that he can circumvent Congress’s authority,” he said.

Reid also expressed frustration at lawmakers’ failure last year on postal reform. “This unfortunate scenario could have been wholly prevented if the House had passed the Senate’s bipartisan postal reform bill in the last Congress,” he said.

Sen. Susan Collins (R-Maine), who serves on the Senate Appropriations Committee and supported the Senate’s bill last year, said, “The Postal Service’s decision to eliminate Saturday delivery is inconsistent with current law and threatens to further jeopardize its customer base.”

Other Republicans applauded Donahoe.

Rep. Darrel Issa (R-Calif.), chairman of the House Committee on Oversight and Government Reform, which oversees the Postal Service, supports the plan. His office said the Postal Service could legally alter Saturday mail services despite any future provisions Congress might enact to require six-day delivery. “In its announced change, USPS is not eliminating a day of delivery, but rather altering what products are delivered on that day,” a spokesman said.

The Postal Service did not respond to requests for comment Thursday. Although it plans to end Saturday mail delivery, it has said that it will continue delivering packages on Saturdays and that post offices will be open to sell stamps and other materials. Post office boxes will receive mail on Saturdays, but magazines and some newspapers, catalogues and Netflix will not reach homes that day.

Sen. Bernard Sanders (I-Vt.), who opposes Donahoe’s decision, said in an interview Thursday that he would fight any effort to remove the six-day-delivery requirement from the next spending bill. But he stopped short of saying he would vote against an appropriations bill that does not include the mandate.

“The future of the Postal Service is very important, but it has to be looked at in a broader context,” Sanders said.

Last year, the House and Senate produced competing bills to help staunch the Postal Service’s financial losses. The Senate approved legislation that would have delayed five-day mail delivery for two years while trying out other cost-saving tactics, but the House never voted on the measure. A House bill that would have ended Saturday delivery right away never reached the floor.

House Appropriations Chairman Harold Rogers (R-Ky.) said he had no idea what his committee would do about the postal plan.

Said Rep. Steny H. Hoyer (D-Md.): “I think the problem is the will of the Congress has not been expressed. Congress has not acted, and I think that left a vacuum.”

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Scores missing after ferry sinks in Bangladesh: officials

DHAKA: Scores of people are missing after a ferry carrying around 100 passengers sank in a river in Bangladesh on Friday, officials said.

"So far we have gathered that the ferry was carrying around 100 people and some have swum to the banks," local police chief Jahangir Hossain told AFP after the accident on the Meghna river in the central district of Munshiganj.

District administrator Saifuddin Badal said that more than 50 people were still unaccounted for.

"We heard around 25 people have swum ashore," he told AFP.

Badal said the boat, named MV Sarosh, was carrying passengers from the capital Dhaka to the southeastern district of Chandpur.

It was not immediately clear what caused the accident but Bangladesh has a history of boating disasters as a result of lax safety standards and frequent overloading of vessels.

Last March 147 people were killed after a passenger vessel sank in the Meghna river after colliding with a cargo ship.

-AFP/fl

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Protest led by Congress minister turns violent, workers ransack DM's office in Bengal

BERHAMPORE: A demonstration led by Union minister of state for railways Adhir Chowdhury turned violent and led to the storming of the district magistrate's office in Murshidabad on Thursday. Though Adhir climbed on a jeep and tried to pacify Congress supporters, the damage was done.

Bricks, stones, broken glass and debris from a wrecked podium for VIP visits lay strewn about the office compound. Adhir and Pradesh Congress president Pradip Bhattacharya denied there was any vandalism but video footage and photographs say otherwise.

The show of might by Adhir is being seen as an attempt to reclaim his image as a Congress strongman at a time when party rebel turned Trinamool minister Humayun Kabir has mounted a bitter campaign in the run-up to the Rezinagar assembly bypoll on February 23. Bhattacharya even defended Adhir, saying: "What is wrong with wanting to meet the DM? I categorically say there was no violence."

Adhir led a 1,500-strong rally to the gates of the DM's office in protest against the alleged custodial death of a Congress supporter. Safiqul Haq, 58, had died in Berhampore jail on January 7 after spending a month behind bars for possession of heroin. Police had never sought his custody but the Congress alleges he was arrested on false charges and died due to police atrocity. The party moved court and a magisterial inquiry identified the cause of death as respiratory trouble due to fluid accumulation in the chest.

But the Congress trained its guns on SP Humayun Kabir, accusing him of acting for the Trinamool Congress. On Thursday, the entire state Congress leadership — Adhir, Bhattacharya, Abdul Mannan, MPs Mannan Hossain and Abhijeet Mukherjee and 13 MLAs — turned up at the protest meeting in front of the collectorate along with Haq's widow Safina Bewa. They demanded that the district magistrate Rajeev Kumar accept a memorandum against the SP.

Around 1:30pm, 14 Congress leaders set off to submit the memorandum (that was not signed by Adhir) but Kumar was busy and asked them to meet ADG (general) Niranjan Kumar. The delegation returned to the dharna mancha and informed the leadership. It was 3.05pm. Bhattacharya had barely left his seat to address the gathering when Adhir grabbed the microphone and said: "The DM has insulted the Congress workers. We will not tolerate this. I give him 30 minutes to meet us. Or else we will go to his bungalow and gherao him. I will lead people there."

The crowd got restive. Bhattacharya tried to continue his speech but had to give in to the crowd 10 minutes later. Adhir got off the stage and led the crowd to the DM's office. The mob kicked open the gates and went on the rampage. The 70-odd policemen stepped aside and watched the violence. Kumar then called Adhir and urged him to step into his home to meet him. Adhir and Bhattacharya went in even as the crowd went berserk outside. After he came out, Adhir climbed on a damaged jeep and tried to calm the supporters but they took their time to settle down.

Adhir later denied there was any violence. "I can tell you very categorically that none of our Congress workers entered the premises of the district magistrate. No vandalism took place," he said. Bhattacharya backed him, saying: "There was no ransacking of the DM's office. That is totally wrong. Nobody entered it. I am not going to justify this, but I can tell you that no property was damaged," he said.

The DM and the SP were closeted in a two-hour meeting in the evening. "We are trying to find out who provoked the mob," the SP said.

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Asteroid to Make Closest Flyby in History

Talk about too close for comfort. In a rare cosmic encounter, an asteroid will barnstorm Earth next week, missing our planet by a mere 17,200 miles (27,700 kilometers).

Designated 2012 DA14, the space rock is approximately 150 feet (45 meters) across, and astronomers are certain it will zip harmlessly past our planet on February 15—but not before making history. It will pass within the orbits of many communications satellites, making it the closest flyby on record. (Read about one of the largest asteroids to fly by Earth.)

"This is indeed a remarkably close approach for an asteroid this size," said Paul Chodas, a research scientist at NASA's Jet Propulsion Laboratory Near Earth Object (NEO) program office in Pasadena, California.

"We estimate that an asteroid of this size passes this close to the Earth only once every few decades."

The giant rock—half a football field wide—was first spotted by observers at the La Sagra Observatory in southern Spain a year ago, soon after it had just finished making a much more distant pass of the Earth at 2.6 million miles (4.3 million kilometers) away.

This time around however, on February15 at 2:24 pm EST, the asteroid will be passing uncomfortably close—ten times closer than the orbit of the moon—flying over the eastern Indian Ocean near Sumatra (map). (Watch: "Moon 101.")

Future Impact?

Chodas and his team have been keeping a close eye on the cosmic intruder, and orbital calculations of its trajectory show that there is no chance for impact.

But the researchers have not yet ruled out future chances of a collision. This is because asteroids of this size are too faint to be detected until they come quite close to the Earth, said Chodas.

"There is still a tiny chance that it might hit us on some future passage by the Earth; for example there is [a] 1-in-200,000 chance that it could hit us in the year 2080," he said.

"But even that tiny chance will probably go away within the week, as the asteroid's orbit gets tracked with greater and greater accuracy and we can eliminate that possibility."

Earth collision with an object of this size is expected to occur every 1,200 years on average, said Donald Yeomans, NEO program manager, at a NASA news conference this week.

DA14 has been getting closer and closer to Earth for quite a while—but this is the asteroid's closest approach in the past hundred years. And it probably won't get this close again for at least another century, added Yeomans.

While no Earth impact is possible next week, DA14 will pass 5,000 miles inside the ring of orbiting geosynchronous weather and communications satellites; so all eyes are watching the space rock's exact trajectory. (Learn about the history of satellites.)

"It's highly unlikely they will be threatened, but NASA is working with satellite providers, making them aware of the asteroid's pass," said Yeomans.

Packing a Punch

Experts say an impact from an object this size would have the explosive power of a few megatons of TNT, causing localized destruction—similar to what occurred in Siberia in 1908.

In what's known as the "Tunguska event," an asteroid is thought to have created an airburst explosion which flattened about 750 square miles (1,200 square kilometers) of a remote forested region in what is now northern Russia (map).

In comparison, an impact from an asteroid with a diameter of about half a mile (one kilometer) could temporarily change global climate and kill millions of people if it hit a populated area.

Timothy Spahr, director of the Minor Planet Center at Cambridge, Massachusetts, said that while small objects like DA14 could hit Earth once a millennia or so, the largest and most destructive impacts have already been catalogued.

"Objects of the size that caused the extinction of the dinosaurs have all been discovered," said Spahr. (Learn about what really happened to the dinosaurs.)

A survey of nearly 9,500 near-Earth objects half a mile (one kilometer) in diameter is nearly complete. Asteroid hunters expect to complete nearly half of a survey of asteroids several hundred feet in diameter in the coming years.

"With the existing assets we have, discovering asteroids rapidly and routinely, I continue to expect the world to be safe from impacts in the future," added Spahr.

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