Scientists search for biosignatures by combining chemistry, geology, biology, and astronomy to detect possible signs of life in rocks, air, water, and light.

Learn how to explain astrobiology in simple terms, with key concepts, examples, and talking points for students, writers, and curious readers.

Learn what a biosignature is, where scientists look for it, and why interpreting life’s chemical clues is harder than it seems.

Learn what space weather alerts mean, who issues them, and how to use them to protect technology, safety, and planning.

Explore the observations and methods astronomers use to confirm exoplanets, from transits and radial velocity to direct imaging and gravitational lensing.

Explore how microbes, algae, and even complex ecosystems persist beneath ice in extreme cold, darkness, and low oxygen.

Enceladus is one of the most compelling places to search for extraterrestrial life because it has liquid water, organic molecules, and hydrothermal activity.

Learn how space weather starts on the Sun, travels through the solar system, and affects satellites, power grids, and GPS on Earth.