Galaxies are giant clusters of stars. They are biggest objects in the universe. Actually they are not objects, they are biggest recognizable structure consists of stars. Typical galaxies consists of billions of stars. They are so unimaginably big, yet we can't see them with naked eye. We require very power full telescopes like Hubble, because they are far-far away from us. Here are some col shots of stars clusters called GALAXIES otherwise.
M81
M74
M51
M82
M104
NGC1300
Sombrero
ARP274
NGC 5753
NGC 4414
NGC 6217
