Extraterrestrial Life

Some proposed exoplanets have proved to be more massive objects such as brown dwarfs or stars, and some may prove not to exist at all

NASA hopes that Kepler will eventually turn up habitable, Earth-like worlds

Universes with different physical laws might still be habitable

Could extrasolar planets consist of graphite and diamond?

Few flying cars and no fountains of youth: Since 2000 many old science goals have remained as far away as ET's signals

A wide range of organisms generate their own light to seek mates, sustenance and survival--inspiring researchers and moviemakers alike

A trio of studies presents evidence for the more elusive small planets orbiting nearby stars

For more than 40 years, missions throughout the solar system have sent back stunning images of our home planet

Saturn's icy moon Enceladus is an intriguing target for astronomers and planetary scientists—it is a small body whose surface fractures and fissures speak to ongoing geological activity.

Evolution helps us imagine what aliens might be like