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From Universe Today:  Galaxies can range in size from having just a few million stars to well over a trillion stars. But have you ever wondered, what’s the largest galaxy in the Universe. The Universe is a big place, and we’ll probably never be able to see every single galaxy. So we can never know for sure what the biggest galaxy is. Instead, we’ll have to go with, what’s the largest galaxy that we know of?

The largest galaxies in the Universe are the giant elliptical galaxies. These are large, egg-shaped galaxies with trillions of stars. They’re formed through multiple collisions between smaller spiral galaxies of similar size. For example, when our own Milky Way collides with the same sized Andromeda Galaxy in a few billion years, the outcome will probably be a giant by Text-Enhance" href="http://www.universetoday.com/30701/what-is-the-largest-galaxy/">elliptical galaxy, with about a trillion stars.

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