For anyone curious about what it's like to stand on another planet, Earth offers a few convincing previews. Mars may be 140 ...

Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

A pull in the right direction ...

It looks like a sapphire jewel in space, but HD 189733bis anything but serene. With winds reaching seven times the speed of ...

"Without Mars, Earth's orbit would be missing major climate cycles. What would humans and other animals even look like if ...

Some 350 light-years away, the V1298 Tau system features an infant sun-like star, just 23 million years old, orbited by four ...

At half the size of Earth and one-tenth its mass, Mars is a featherweight as far as planets go. Yet new research reveals the ...

Evidence from fossil shells suggests that falling seawater calcium helped lock away carbon dioxide and helped cool Earth after the dinosaurs.