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 ...

For many years scientists have been wondering if a mysterious ninth planet lurks in our Solar system. “Planet Nine”, dubbed, has fascinated scientists for its ability to account for “anomalous” ...

This may explain the strange properties of the orbits of our solar system's planets, which are not quite perfectly circular, and all lie on slightly different planes. NASA artist’s conception of ...

one which can offer superb views of the other bodies in the solar system. But which one to choose? We've got you covered with our guide to the best telescopes for seeing planets. Now's a great ...

A rare celestial event is set to take place, with all of our solar system's planets lining up through the night sky at once. This extraordinary spectacle, known as a great planetary alignment ...