(What is the future of the human race?
Up until the 1920s, everyone thought
The universe was essentially static and unchanging in time
Then it was discovered that the universe was expanding
Distant galaxies were moving away from us
This meant they must have been closer together in the past
If we extrapolate back, we find they must have all been on top of each other)
Are we alone in the universe?
Is there alien life out there?
What is the future of the human race?
Up until the 1920s, everyone thought
The universe was essentially static and unchanging in time
Then it was discovered that the universe was expanding
Distant galaxies were moving away from us
This meant they must have been closer together in the past
If we extrapolate back, we find they must have all been on top of each other
About fifteen billion years ago
This was the big bang, the beginning of the universe
But was there anything before the big bang?
If not, what created the universe?
Why did the universe emerge from the big bang the way it did?
We use to think that the theory of the universe could be divided into two parts
What is the future of the human race?
Up until the 1920s, everyone thought
The universe was essentially static and unchanging in time
Then it was discovered that the universe was expanding
Distant galaxies were moving away from us
This meant they must have been closer together in the past
If we extrapolate back, we find they must have all been on top of each other