“Exoplanet Rosetta Stone” –Carl Sagan Astronomers Using Life on Early Earth

Exoplanet Colors of Life

 

“Astronomers had concentrated only on vegetation before, but with a better color palette, researchers can now look beyond a half-billion years and up to 2.5 billion years back on Earth’s history to match like periods on exoplanets,” said Lisa Lisa Kaltenegger, Cornell University professor of astronomy and director of the Carl Sagan Institute. “If an alien had used color to observe if our Earth had life, that alien would see very different colors throughout our planet’s history – going back billions of years – when different life forms dominated Earth’s surface.” (more…)