The
recent bruising Jupiter received from a cosmic impact is a violent reminder
that our solar system is a shooting gallery that sometimes blasts Earth.
Still,
what are the odds of a cosmic impact threatening our planet?
So
far 784 near-Earth objects (NEOs) more than a half-mile wide (1 km) have been
found.
"If
an object of about the same size that
just hit Jupiter also hit Earth — it was probably a typical cometary object
of a kilometer or so in size (0.6 miles) — it would have been fairly
catastrophic," explained astronomer Donald Yeomans, manager of NASA's
Near-Earth Object program office at the Jet Propulsion Laboratory in Pasadena,
Calif.
Scientists
have ruled out the chances
of an Earth impact for all of these 784 large NEOs. Still, lesser objects
also pose a risk, and researchers estimate more than 100 large NEOS remain to
be found.
Small risk
Billions
of years ago, impacts were far more common. Our moon retains a record of the
pummeling it and Earth took: the moon's craters remain, while on Earth, most scars
of ancient impacts have been folded back into the planet or weathered away.
Today's
solar system is far less crowded, and in fact Jupiter, having more mass and
gravity, scoops up a lot of the dangerous objects, as does the sun.
Currently
just one NEO of all the objects scientists are tracking poses any significant
chance of hitting the Earth — 2007 VK184. If this roughly 425-foot-wide (130
meters) asteroid hit our planet, it would strike with an energy of roughly 150
million tons of TNT, or more than 10,000 times that of the atom
bomb dropped on Hiroshima.
Roughly
100 telescopic observations made so far suggest that 2007 VK184 has a
1-in-2,940 chance of hitting Earth 40 to 50 years from now. However, if the
past is any guide, further observations to refine computations of its orbit
very likely will downgrade its probability of hitting Earth to virtually
nothing, Yeomans said.
Of
remaining concern are the NEOs that we do not see. Researchers suspect about
156 large NEOs 1 kilometer in diameter or larger remain to be found, and when
it comes to dangerous NEOs in general, "when we get down to 140 meters
(460 feet) or larger diameter objects, we think we've discovered about 15
percent of them, and with 50 meters (164 feet) or larger diameter, we've
discovered less than 5 percent of them," Yeomans explained.
On
average, an NEO roughly a half-mile wide or larger hits the Earth roughly every
500,000 years, "so we're not expecting one anytime soon," Yeomans
explained.
"For
500 meters (1,640 feet), we're talking a mean interval of about 100,000
years," he added. "When you get down to 50 meters, the mean interval
is about 700 years, and for 30 meters (98 feet), about 140 years or so, but by
then you're getting down to a size where you won't expect any ground damage, as
they burn up in the atmosphere at about 25 meters (82 feet) in diameter and
smaller, probably for an impressive fireball event."
When
it comes to truly monstrous
NEOs some 10 kilometers (6.2 miles) or larger, of the size thought to have
helped kill off the dinosaurs, "that's a 100 million year event, and in
fact, I don't think there is anything like that we see right now," Yeomans
said. "The largest near-Earth object that can actually cross the Earth's
path, Sisyphus, has a diameter of 8 kilometers (5 miles), and the largest that
is termed a potential hazard is Toutatis, which has a diameter of approximately
5.4 km (3.35 miles)."
Keeping watch
There
are currently four teams worldwide actively looking for both large and small
NEOs, Yeomans said. "We're concentrating on the large ones for now, but
hopefully with the next generation of search, we'll be more efficient in
finding the smaller objects, to find 90 percent of the total population of
potential hazards larger than 140 meters," he added.
Keeping an
eye on NEOs might not just be healthy for humanity, but also help lead us out
into space.
"They're
easy objectives to get to, and asteroids have significant metal resources that
can be mined, while comets have significant water resources for space habitats
or travel," Yeomans said. "If you want to build a habitat in space,
you're not going to build it all on the ground and launch it up, since that's
too expensive — you want to go up and look for resources instead."
Furthermore,
asteroids and comets are among the objects that have changed the least since
the birth of the solar system roughly 4.6 billion years ago, and might reveal
vital clues behind the mysterious process.
"They
may well have delivered the water and carbon-based molecules to Earth that
allowed life to form, so they're extremely important for study in that
direction," Yeomans added.
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