User blog comment:Warmachine375/Why Marvel Universe is being divided into different alternate universes?/@comment-4651179-20120517200806

The alternate universe exist to create and elaborate different stories which would be impossible to show in the Mainstream Universe (such as "What If...?" and "Age of Apocalypse") and explore different ideas. Also they can be created to make crossovers with another, which is pretty cool, if Earth can interact with other planets, why not other universes? (such as "Squadron Supreme" or "Marvel Zombies"). Also, creating a universe from zero can help to bring new readers (such as "Ultimate Marvel" or "Marvel Age")