The astronomers were in for a shock: our universe is not slowing down. It is speeding up. The Entire History of the Universe e9: Where Did Dark Matter & Dark Energy Come From? 2021
And to account for this accelerated expansion there was something else in the universe. Something unexpected driving the cosmos faster and faster. ibid.
What are these new components of our universe? How do they work? And where did they come from? ibid.
Most of the matter in our universe is completely dark. ibid.
Where did all this cosmic structure come from?
The other dark component – dark energy … Just what was this new dark mysterious stuff of the universe?
This universal expansion is accelerating.
Dark energy made up the remainder – 70% of the universe. ibid.
Dark energy has a tension that pulls. ibid.
Cosmic pie: 69% dark energy, 26% dark matter, 5% ordinary matter. Universe Unravelled with the Stephen Hawking Centre s1e17: Cosmic Pies (short), 2020
The next piece of the puzzle … Dark Energy and Dark Matter. Universe Unravelled with the Stephen Hawking Centre s1e22: Modified Theories of Gravity (short)