Black stones land near an Australian town. Gather the Murchison meteorite's pieces and you have about a wheelbarrow load. Hidden in that rock are parts your cells use to build proteins.
The fall happened in 1969. Scientists have since found more than 80 kinds of amino acids, small molecules that can link like beads on a thread. Rock chemistry can make them without anything being alive.
Then comes the awkward question: did the stone pick those parts up from the soil? Scientists tested their shapes and the mix of heavy and light atoms. Much of the chemistry points beyond Earth, though dirt can add false clues.
So spacecraft went straight to Bennu and Ryugu and brought back sealed samples. They held carbon-based molecules too. Scientists call these organic molecules. The word does not mean a living thing made them.
Panspermia (pan-sper-mee-uh) is the idea that life's parts, or life itself, could travel between worlds. These rocks show that parts can arrive. Nobody has confirmed life in a meteorite. Some shielded bacteria survive years in space tests, but that does not prove a trip between planets. We know the chemistry travels. How it became life is still open.
