Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a ...

An asteroid smacking into Mars could eject debris high above the Red Planet. If Deimos and Phobos formed from debris resulting from an asteroid collision on Mars, they must be younger than the Red ...

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.

“Most planetary collision scenarios are classified ... For example, Mars is orbited by two tiny potato-shaped moons called Phobos and Deimos, which are likely two asteroids that were captured ...

A long-lost moon could explain why Mars is so different from the other rocky planets in the solar system. Today, Mars has two tiny moons. But early in its history, the Red Planet may have had a ...

From January to March, the night sky will host a spectacular parade of planets featuring Venus, Mars, Jupiter, Saturn, Uranus ...

“Most planetary collision scenarios are classified as ... (Pluto has four smaller moons besides Charon.) For example, Mars is orbited by two tiny potato-shaped moons called Phobos and Deimos, which ...

"When people find out about that they're going to say 'who put that there?'," Buzz Aldrin once said of the monolith.

Mars has two small moons, Phobos and Deimos. Phobos is gradually spiralling inward towards Mars and is expected to crash into the planet within 40 million years, potentially forming a ring system ...

Egyptians called it "Her Desher," which means "the red one." Mars takes 687 days, or 1.8 years, to orbit the sun. It has two moons, Phobos and Deimos. This story was updated to add new information.