Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

NASA researchers got a rare chance to study Uranus' atmosphere and rings this month, when the ice giant passed between Earth ...

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

The Hubble Space Telescope time-lapse captured footage of Jupiter, Saturn, Uranus and Neptune. Credit: SCIENCE: NASA, ESA, ...

These types of exoplanets are some of the most common in our galaxy - but they've remained mysterious until now.

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner consistent with a large, distant planet.

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

Over the past decade or so, astronomers have speculated about the characteristics of rogue planets in the Milky Way galaxy. These "free-floating" worlds don't orbit stars, but instead roam the ...