Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

When the Sun expands into a red giant, it will swallow the inner solar system and raise the temperature in the outer regions.

Researchers in the US have suggested there is a 40 percent chance a ninth planet could exist in our solar system. Planet Nine ...

Moving from the outer layer inward, the first layer is the corona — the outermost part of the sun’s atmosphere that is ...

Imagine a world without sunlight. No warm rays on your face, no vibrant colors, just an endless, frigid twilight. While it ...

A superbright Mars is currently visible alongside Regulus, the "Heart of the Lion" star located around 79 light-years from ...

The Rubin Observatory will reveal its first images on Monday. Space.com spoke to scientists who explained why this will be a ...

Located inside galaxies, these cosmic arrangements are made up of at least one star and all the objects that travel around it, including planets, dwarf planets ... about 4.5 billion years ago ...

In an exciting breakthrough in planetary science, a recent study has increased the likelihood of Planet Nine’s existence by ...

Summer arrives for northern observers as the Moon visits Venus, Uranus, and Mercury. Plus: globular cluster M15, double star ...

If our solar system seems stable, it's because our short lifespans make it seem that way. Earth revolves, night follows day, ...

The orange dwarf Gliese 710 is expected to come within 0.1663 light-years or 10,520 astronomical units in about 1.29 million ...