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2 million light years 

M31 

Andromeda 

globular 

by gravity -- every bee, a sun.

We are now only 2 million light years from home. On the maps of space, this galaxy is called M31, the great galaxy Andromeda. It's a vast storm of stars and gas and dust. As we pass over it, we see one of its small satellite galaxies. Clusters of galaxies and the stars of individual galaxies are all held together by gravity. Surrounding M31 are hundreds of globular star clusters. We are approaching one of them. Each cluster orbits the massive centre of the galaxy, some contain up to a million separate stars. Every globular cluster is like a swarm of bees bound by gravity -- every bee, a sun.

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