Did The Seeds Of Life Ride To Earth Inside An Asteroid
Some astronomers think life’s heritage must have begun off-planet, because amino acids have been discovered in meteorites, celestial time capsules composed of the same primitive materials from which our solar system formed. (A meteorite is a fragment of an asteroid or any other space rock that has fallen to Earth.) But despite their best efforts, scientists can’t pin down exactly how these molecules got there. Experiments in the lab can’t reproduce what’s found in nature....