DNA Comes From Outer Space
I’m a fan of panspermia, particularly the idea the mushroom spores traveled to Earth and gave humans a little extra something. The concept was given a real boost this week with news that components of DNA, nucleobases, have been found in meteorites:
In laboratory experiments, Callahan and colleagues showed how the nucleobases could have formed inside meteorites. Simple chemical reactions involving ammonia, water and hydrogen cyanide — all ingredients found in meteorites — produced the wide range of nucleobases the scientists found in the space rocks.
…Scientists have also found other building blocks of life — most notably amino acids, the links that form proteins — inside meteorites.
While Bernstein said that it’s impossible to discern whether the first life on Earth was built on chemicals that fell from the sky, that possibility is now stronger. “These molecules are at the core of [life’s] blueprints,” Bernstein said of the nucleobases. “It’s possible that the presence of these molecules in meteorites made us what we are today.” [Source: Washington Post]
The other possibility is that those ingredients helped life form elsewhere in the universe, and that life itself arrived on Earth, rather than forming in the primordial soup. As time goes on, evidence (and theories from the likes of Mike Baillee) is growing, and it seems certain that past humans have been affected by bombardments from space. Which means comets, meteorites, dust, red rain, or even mushrooms from space will return one day…