Summary:

• **Most galaxies are moving away from us** - Scientists discovered that almost every large galaxy in the universe is moving away from the Milky Way (our galaxy), kind of like how dots on a stretching balloon move apart from each other. This happens because space itself is expanding everywhere in the universe.

• **Andromeda is the special exception** - There is one big galaxy called Andromeda that is actually moving *toward* us instead of away, and scientists finally figured out why! Andromeda is moving toward us because gravity is pulling it closer, and it will eventually crash into our galaxy in billions of years.