The size of the Solar System and the Universe is truly beyond our comprehension. When we think of the vastness of space, we often imagine distances that stretch far beyond the Earth, yet even our ...

A gas giant exoplanet is triggering flares from its host star that will ultimately destroy it, according to European Space Agency research.

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to oblivion ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its status as the ninth planet in our Solar System.

Simultaneously cooling Pluto while energizing atmospheric molecules to allow them to escape into space, Pluto's haze plays a key role in the planet's energy balance.

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have discovered a new planet in our solar system.

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach its closest point to the sun is in the year 26186.

Scientists have discovered a new dwarf planet candidate far beyond Pluto in the solar system. Its existence could mean there's no Planet 9.

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in our solar system.

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in our solar system.

Trans-Neptunian objects are minor planets that orbit the sun at a greater average distance than the orbit of Neptune. The new TNO is special for two reasons: its extreme orbit and its large size.

New Minor Planet Spotted Past Pluto, One of the Largest Distant Objects in the Solar System The surprisingly large world has a massive orbit—about 838 times Earth’s distance from the Sun.