Astronomers have discovered that "super-Earth" planets may exist on wider orbits than previously thought — and this implies these rocky, or "terrestrial," worlds are far more common than was suspected ...

European researchers have demonstrated that a species of lichen can survive the extreme conditions of the Red Planet.

Wave-like soil patterns on the Martian surface match those found in Earth's cold, mountain regions, which could help ...

Comets that have hit Earth have been a mixed bag. Early in Earth's history, during the solar system's chaotic beginning, they ...

"The extent of the tail is gargantuan, stretching up to 9 million kilometers [5.6 million miles] long," said MIT astronomer ...

Astronomers discovered a planet that orbits its star so closely that its surface is being scorched into magma and vaporizing ...