Did Life Come from Space?
The same amino acids that are here on Earth have also been found in meteorites. “The bottom line is that you have these materials that come from space,” says researcher Steve Macko. He thinks this points to a cosmic origin for life on Earth.
Making the case for our cosmic origin is the fact that all of the meteorite’s amino acids favor the “left-handed” molecular structure, which is also favored by life on Earth, but just why life chose left over right is a mystery. “Essentially all of your protein is made of L-amino acids,” said Macko. “Why is that? We don’t know. The curious thing is that if you go to a meteorite you find a predominance of the same thing.”
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