| A galaxy is a collection of solar masses that contains between 100,000 and 3,000 billion stars. Galaxies are grouped together in clusters and super clusters and come in various forms. No one knows exactly how many galaxies there are in the Universe, but our galaxy - the Milky Way - is just one of thousands, even millions. The Milky Way is a spiral galaxy that stretches 100,000 light years in diameter and from our Earth-bound view it looks like two fried eggs back-to-back! Spiral galaxies tend to include younger and brighter stars, whereas eliptical galaxies, which are the most common type, usually contain older stars. Andromeda is sometimes described as our ‘twin’ galaxy, because it is about the same size, shape and age as the Milky Way. | 
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