One of seven Earth-sized planets, TRAPPIST-1d, caught the attention of NASA researchers and is one of the promising planets ...

Venus spins slowly, yet its upper atmosphere races around the planet at roughly 220 miles per hour, a supercharged jet stream ...

For decades, the search for alien life has revolved around a narrow ring around stars where liquid water could exist on a planet’s surface. That “habitable zone” remains important, but astronomers are ...