Final answer:
The concept of multiple universes (the multiverse) is a hypothesis that suggests our universe is one of countless universes with different physical laws.
Some universes may collapse or expand rapidly while others evolve into separate and unique universes.
The existence of a multiverse allows for the possibility of different realities co-existing in alternate dimensions beyond our awareness.
Step-by-step explanation:
Some scientists speculate that our universe is but one of countless universes, each with a different set of physical laws-an idea that is sometimes referred to as the multiverse.
Some of those universes might be stillborn, collapsing before any structure forms. Others may expand so quickly that they remain essentially featureless with no stars and galaxies. In other words, there may be a much larger multiverse that contains our own universe and many others.
This multiverse (existing perhaps in more dimensions that we can become aware of) is infinite and eternal; it generates many, many inflating regions, each of which evolves into a separate universe, which may be completely unlike any of the other separate universes.
Our universe is then the way it is because it is the only way it could be and have humans like ourselves in it to discover its properties and ask such questions.