THE search for alien life across our Solar System and beyond has so far kicked up nothing intelligent – let alone microbial.

For circumbinary exomoons, our research shows that it would be best to search in systems that have a wide binary separation, as stable moons were able to orbit at up to 10% of their planet's hill ...

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

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

It has a surface temperature of over 470°C. Only two of the terrestrial planets have moons orbiting them: Jupiter is the largest planet in the solar system and has 79 moons. The four largest ...

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.

Dexter defines The Galilean Suite as tone poems, but while Holst’s inspiration for The Planets was astrological ... and it’s his names for the moons that have stuck,” said Dexter.

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 ...