Elon Musk is taking the long view. The billionaire SpaceX founder has long said that humanity needs to expand its footprint ...

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

The solar system is our cosmic neighborhood, made up of the sun and everything that orbits it — planets, moons, asteroids, comets, and even dust and gas. The order of the planets in the solar ...

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

Researchers discovered Eos, a molecular cloud, using ultraviolet light. It is near Earth and lacks carbon monoxide. This ...

New data from the James Webb Space Telescope suggests a planet in a faraway solar system was consumed by a star by hurling ...

If you want solar power, you usually have to make a choice. You can put a solar panel in a fixed location and accept that it ...

Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

An international team of scientists led by a Rutgers University–New Brunswick astrophysicist has discovered a potentially ...

For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...