The reason given by greene for why he believes parallel universes may exist is that there are only so many ways matter can arrange itself within that infinite universe.
A matter is anything that has weight and occupy space. The whole universe consist of what is know as matter.
However, the theory of multiple universe shows that another universe may exist, which is quite distinct from what is already known to all.
Hence, this theory was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
Learn more about universe here : https://brainly.com/question/23147304
