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 ...

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

If you get the question in Trivial Pursuit “how many plantes are there in the Solar System ... there was another planet, a very big planet, beyond Neptune. The Planet Nine theory was ...

According to a pre-print research ... through our solar system about 4 billion years in the past. This may explain the strange properties of the orbits of our solar system's planets, which are ...

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...