To study the history of life on Earth and look for it beyond our planet, scientists in the field of astrobiology look for signs called “biosignatures.” NASA Goddard researcher Heather Graham discusses some of the oldest evidence of life on Earth and what scientists are searching for when they look for biosignatures in ancient rocks. By looking at what life on Earth was like millions and even billions of years ago, astrobiologists can make predictions about what signs of life could be hiding in the rest of the solar system and beyond.

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