
Outer Space Gases Brought to Earth on Buckyballs
By Deborah Zabarenko
WASHINGTON (Reuters) - Weird
gases from outer space arrived on Earth during a
dinosaur-killing
asteroid strike 65 million years ago, and survive in molecular cages called
buckyballs, researchers reported on Tuesday.
Buckyballs, lacy-looking
molecules made up of carbon atoms, are also known as fullerenes and are
named in honor of
Buckminster
Fuller because they are shaped like the geodesic dome he invented.
They can form on Earth but also are born outside our solar system, in hot areas of the universe such as the gas envelopes around embryonic stars. The buckyballs in question came in on the killer asteroid.
The gas-carrying buckyballs
were found in various parts of the globe, from North America to
New
Zealand to Denmark, in a layer of sediment laid down after an ancient
asteroid impact.
"The buckyballs containing
the gases arrived on Earth about 65 million years ago during an asteroid
impact that scientists theorize ended the age of the dinosaurs," said Ted
Bunch of
NASA's
Ames Research Center in California.
The impact of the big space rock may have killed the dinosaurs and most earthly life with its globe-girdling dust cloud, but the sturdy little buckyballs survived with their gaseous cargo intact, Bunch and his colleagues reported in the March 28 edition of the Proceedings of the National Academy of Sciences.
Inside the buckyballs was
a strange type of cosmic
helium,
along with other gases, Bunch said in a
telephone
interview.
Helium created on Earth usually has four sub-atomic particles in its nucleus, while cosmic helium generally has only three, the scientists said.
"They're enriched helium 3," Bunch said. "We know by the helium signature that it was formed probably outside the solar system ... they've trapped them inside (the buckyballs) at the site of formation."
This weird helium shows,
as no other evidence has, that buckyballs can transport extraterrestrial
gases without letting them escape on the way. Future research may
focus
on other gases that might have come to Earth in this fashion.
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This research also supports the theory that gases that make up Earth's atmosphere and organic compounds came to Earth's surface during the so-called age of bombardment, some 3.8 billion to 4.5 billion years ago, when ``asteroids were running wild in their orbits,'' as Bunch put it.
This was the period when the
Moon's
craters were gouged out by asteroids, comets and meteors, which also slammed
into Earth, Mars and other celestial bodies. Buckyballs
probably drifted into the solar system early on, bringing carbon and other
material from far away.
"Most of the carbon in our
bodies came from outside the solar system,'' Bunch said. "We're all
aliens."
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