Which hypothesis suggests that the universe began from an extremely hot and dense state?

What hypothesis proposes that the universe has no beginning or end and is always expanding at a constant rate?

Which hypothesis suggests that our universe is just one of many universes that exist simultaneously?

What hypothesis suggests that the universe undergoes an endless cycle of expansion and contraction?

Which hypothesis is based on the concept that fluctuations in a quantum field could have led to the creation of the universe?

Which hypothesis involves the idea of the universe experiencing a dramatic exponential expansion immediately after the Big Bang?

Which hypothesis states that the universe is in a constant state of expansion and has no beginning or end?

What hypothesis suggests that the universe is eternal and unchanging?

What hypothesis proposes that the universe is composed of many different dimensions beyond the observable three?

Which hypothesis suggests the universe began from a singularity and expanded rapidly in a hot, dense state?