Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The great planetary parade in February 2025 will see five bright planets in clear view and a special alignment of Mercury and ...

It is not often that all the planets in the Solar System other than ours are lined up across the night sky for us to see.

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

Mercury takes only 88 Earth days to orbit the sun.

Astronomers discovered the gas giant planet — dubbed a "hot Jupiter " — in 2016, but have continued to investigate this ...

Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a ...

If planets had social media accounts, the solar system would showcase a frenzy of unique personalities. Mercury tweets at ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...