Not every planet has a moon – so why do some planets have several moons, while others have none? I'm a physics instructor who ...

A new study implies that in the past, moons in our solar system may have had rings just like planets do — deepening the mystery of why no ringed moons exist today.

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.

Moon along with Mercury; Earth's neighbours Venus and Mars; Jupiter and Saturn will align in a straight line and will be visible in the night sky.

Other exciting things to keep an eye out for in the night sky this month are bright planets. The planets will continue to put ...

Five of the brightest planets will be visible to the naked eye. With help, you may even spot Uranus and Neptune.

However, even some dwarf planets and asteroids have rings, but none of the roughly 300 moons in the solar system have been found to have rings. A detailed simulation to solve this mystery has ...

Charon and Earth’s moon are both a large fraction of the size of the main body they orbit, which is unlike other smaller moons orbiting planets throughout our solar system. (Pluto has four ...