Learn about the size, temperature, and colour of each planet, and discover why Pluto is no longer considered a planet.

If we could go back 101 years, we would encounter a time when scientists still thought the Milky Way was the entirety of our ...

the Andromeda Galaxy will collide with the Milky Way, resulting in a spectacular cosmic collision! Don’t worry, though – the distances between stars are vast, so we won’t feel a thing.