IS OUR UNIVERSE THE ONLY UNIVERSE?

Explain the concept behind the multiverse.
What did astronomer Edwin Hubble discover in 1929?
Explain what the two teams of astronomers found in the 1990s. What question did their discovery create?
What is the mystery Greene discusses and why does he say it is something we should all care about?
Describe String Theory. What is the central idea behind it?
Greene explains that though the Big Bang theory explains how the universe evolved, it fails to explain what actually powered the Bang. How does Greene say the Big Bang was powered and based on this theory, discuss what this means regarding the possible existence of other universes?
WHAT DOES AN EXPANDING UNIVERSE REALLY MEAN?
Discuss why the article says the fact that we’re in our universe complicates our understanding of the expansion of the universe.
Explain the significance behind the universe having a flat geometry.
Discuss how gravity impacts how galaxies behave when they get close to one another.