Astronomers have discovered that there are two different types of galaxies in the Universe: elliptical galaxies and spiral galaxies. Elliptical galaxies are dead galaxies full of very old, red stars that move on chaotic random orbits around the centre of their galaxy in such a way that makes their shape look like fluffy footballs. On […]
Our Galaxy—the Milky Way—is a vast rotating disk containing billions of stars along with huge amounts of gas and dust. Its diameter is around 100,000 light years.