Astronomy › Section V · The Big Bang › Topic V.5
What the universe is made of
Independent measurements now agree on an inventory of the universe, and it is a strange one: the atoms that make up stars, planets and people are only about 5% of the total. The rest is dark matter and dark energy, which we can measure but not yet explain.
In this topic
- The standard model of cosmology
- The cosmic inventory
- Where the ordinary matter is
- Worked example: turning shares into densities
- Independent lines of evidence
- Dark energy takes over
- Worked example: matter versus dark energy at z = 1
- What is dark energy?
- The story in order
- Common mistakes to avoid
- Key takeaways
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