Perseverance takes a selfie with its helicopter companion Ingenuity in the background. NASA/JPL-Caltech/MSSS hide caption
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astrobiology
The Geologic History of Earth. Note the timescales. We are currently in the Holocene, which has been warm and moist and a great time to grow human civilization. But the activity of civilization is now pushing the planet into a new epoch which scientists call the Anthropocene. Ray Troll/Troll Art hide caption
(Top row, left to right) Titan, Earth's moon, Europa and Enceladus. (Bottom row, left to right) Callisto, Charon, Ariel and lo. NASA hide caption
An illustration imagines what Kepler-186f may look like. T. Pyle/NASA Ames/SETI Institute/JPL-Caltech hide caption
Gliese 581e (foreground) is part of a system of planets around a red dwarf sun that may include a body orbiting in the habitable zone. L. Calçada/Illustration/ESO hide caption
An artist's impression of a trio of super-Earths discovered with the ESO's 3.6-m telescope at La Silla, Chile. Illustration/ESO hide caption
Many of life's building blocks can be found in the objects bombarding Earth from outer space. Does that mean that life, too, developed elsewhere before arriving here? Mary P. Hrybyk-Keith/NASA hide caption
An artist's imagination Saturn's orange moon Titan. Steven Hobbs/NASA hide caption
