For decades, scientists have been on the lookout for killer objects from outer space that could devastate the planet. But warnings that they lacked the tools to detect the most serious threats were largely ignored, even as skeptics mocked the worriers as Chicken Littles.
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Dr. Edward Lu, a former NASA astronaut and Google executive, has warned about space threats.
No more. The meteor that rattled Siberia on Friday, injuring hundreds of people and traumatizing thousands, has suddenly brought new life to efforts to deploy adequate detection tools, in particular a space telescope that would scan the solar system for dangers.
A group of young Silicon Valley entrepreneurs who helped build thriving companies like eBay, Google and Facebook has already put millions of dollars into the effort and saw Friday’s shock wave as a turning point in raising hundreds of millions more.
“Wouldn’t it be silly if we got wiped out because we weren’t looking?” said Edward Lu, a former NASA astronaut and Google executive who leads the detection effort. “This is a wake-up call from space. We’ve got to pay attention to what’s out there.”
Astronomers know of no asteroids or comets that pose a major threat to the planet. But NASA estimates that fewer than 10 percent of the big dangers have been discovered.
Dr. Lu’s group, called the B612 Foundation after the imaginary asteroid on which the Little Prince lived, is one team of several pursuing ways to ward off extraterrestrial threats. NASA is another, and other private groups are emerging, like Planetary Resources, which wants not only to identify asteroids near Earth but also to mine them.
“Our job is to be the first line of defense, and we take that very seriously,” James Green, the director of planetary science at NASA headquarters, said in an interview Friday after the Russian strike. “No one living on this planet has ever before been hurt. That’s historic.”
Dr. Green added that the Russian episode was sure to energize the field and that an even analysis of the meteor’s remains could help reveal clues about future threats.
“Our scientists are excited,” he said. “Russian planetary scientists are already collecting meteorites from this event.”
The slow awakening to the danger began long ago, as scientists found hundreds of rocky scars indicating that cosmic intruders had periodically reshaped the planet.
The discoveries included not just obvious features like Meteor Crater in Arizona, but wide zones of upheaval. A crater more than a hundred miles wide beneath the Yucatán Peninsula in Mexico suggested that, 65 million years ago, a speeding rock from outer space had raised enough planetary mayhem to end the reign of the dinosaurs.
Some people remain skeptical of the cosmic threat and are glad for taxpayer money to go toward urgent problems on Earth rather than outer space. But many scientists who have examined the issues have become convinced that better precautions are warranted in much the same way that homeowners buy insurance for unlikely events that can result in severe damage to life and property.
Starting in the 1980s and 1990s, astronomers turned their telescopes on the sky with increasing vigor to look for killer rocks. The rationale was statistical. They knew about a number of near misses and calculated that many other rocky threats whirling about the solar system had gone undetected.
In 1996, with little fanfare, the Air Force also began scanning the skies for speeding rocks, giving credibility to an activity once seen as reserved for doomsday enthusiasts. It was the world’s first known government search.
The National Aeronautics and Space Administration took a lead role with what it called the Spaceguard Survey. In 2007, it issued a report estimating that 20,000 asteroids and comets orbited close enough to the planet to deliver blows that could destroy cities or even end all life. Today, with limited financing, NASA supports modest telescopes in the southwestern United States and in Hawaii that make more than 95 percent of the discoveries of the objects coming near the Earth.
Scientists lobbied hard for a space telescope that would get high above the distorting effects of the Earth’s atmosphere. It would orbit the Sun, peering across the solar system, and would have a much better chance of finding large space rocks.
But with the nation immersed in two wars and other earthly priorities, the government financing never materialized. Last year, Dr. Lu, who left the NASA astronaut corps in 2007 to work for Google, joined with veterans of the space program and Silicon Valley entrepreneurs to accelerate the asteroid hunt.
