For a long time, children learning about space in school were taught that there were nine planets in our solar system. Then, we lost Pluto after it was demoted to a dwarf planet back in 2006 and ...

If Brown’s hidden world is real, Rubin will almost certainly find it or strong indirect evidence that it exists. “In the ...

Astronomers are on the hunt for a mysterious ninth planet, known as Planet Nine, which could change our understanding of the solar system. Is this hidden world real, or just a myth?

"Even if a planet is in the habitable zone, if it has too small a water inventory, it transitions to an uninhabitable state." ...

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars. When you purchase through links on our site, we may earn an affiliate commission.

A planet parade is when several of our solar system's planets are visible in the night sky at the same time. There will be six planets visible this time around, including Venus, Mars ...

Eris was discovered. It was considered the largest known dwarf planet in the solar system until a year later when Pluto was ...

The solar system is approximately 4.6 billion years old. Astronomers believe that roughly 100 million years into its existence, the planets first began to form in a rotating, flat cloud of gas ...

• Saturn, of magnitude +1.1, 16° to the upper left of Venus. The brighter planet will pass 2.2° north of Saturn on Jan. 18; Saturn will be nearly 11° below Venus on Jan. 31. A telescope reveals Saturn ...