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

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.

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

Four planets will be widely visible to the naked eye through part of February, but calling them a 'planetary alignment' may not be the full picture.

For the first time, astronomers have imaged dozens of belts around nearby stars where comets and tiny pebbles within them are ...

The rare astronomical event will see Mars, Jupiter, Uranus, Venus, Neptune, Mercury and Saturn appear at the same time, ...

Pluto isn't alone—it's part of the Kuiper Belt with possibly hundreds of other planet-sized objects. Because Pluto hasn't ...

'Planet parade' isn't a technical term in astronomy but it is one widely used to describe the alignments of planets. The ...

Scientists have been unable to determine whether the dwarf planet’s organics were produced by its own chemical processes or ...

A planet parade is when several of our solar system's planets are visible in the ... close to the sun to be readily visible with Venus not far behind, leaving Jupiter, Mars and Uranus to populate ...