The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Planets with suns like Wolf 359 are subject to huge blasts of radiation that raise questions about their long-term ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Beautiful photos of the six planets aligned in the night sky have emerged online. Mars, Jupiter, Uranus, Neptune, Venus and ...

A pair of dwarf planets lurking in the outer reaches of the solar system could still be geologically active, increasing the chances that they could support alien life, a new study suggests.

A six-planet alignment or parade will form an arc in the early night sky, peaking in it's visibility Jan. 17-18. We let you ...

Move over Saturn! Scientists have found a ring around an unassuming mini-planet in our Solar System to debunk the theory that only giant planets can be so adorned. The planet, dubbed Haumea ...

Skywatchers: A six-planet alignment peaks this week as Mars, Jupiter, Uranus, Neptune, Venus, and Saturn come together for ...

In 2006, the International Astronomical Union (IAU) voted on the definition of a planet. Famously, Pluto no longer met the ...