Scientific Facts about the Universe
The Big Bang · 13.8 billion years · The light year
The Big Bang and the age of the universe
How scientific theories change
The astronomical unit and the light year
Calculating the metres in one light year
In 1920 Georges Lemaitre found the galaxies moving apart
The universe began about 13.8 billion years ago from the explosion of a compressed mass
The universe is made of matter and energy and nothing in it is at rest
🔐
The notes are free to read in full.
Create free account Sign in