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

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

Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

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

February will be an awe-inspiring month for astronomy enthusiasts who will be able to the see the solar system's planets ...

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Mercury takes only 88 Earth days to orbit the sun.

Our solar system’s planets are set to align in a seven-strong planetary parade this week that will be visible in the UK night ...

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

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.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.