What are the biggest groups of stars called?
orbits
cells
novas
galaxies
The biggest groups of stars are called galaxies. A few million to many billions of stars may make up a galaxy. With the unaided eye, every star you can see is part of the Milky Way Galaxy. All the other galaxies are extremely far away. The closest spiral galaxy, the Andromeda Galaxy, shown in Figure below , is 2,500,000 light years away and contains one trillion stars!.