The Universe is

everything that we can ever know all of space

and all of time. It

is almost entirely

empty with small

clusters of matter and energy. Therefore the Universe is about

15 billion years old. However, estimates vary. The Big Bang explosion is how

scientists think

the Universe began 15 billion

years ago. Amazing Fact:

Scientists believe

that because both space and time with the Big Bang there may the possibly be no time before it occurred.