11.3 The Universe
Space, time, matter, energy · Age 13.8 billion years · 46 billion light years across
What space and the universe are
How big the observable universe is
What a light year is a unit of
How the big bang theory was built
Planets, satellites, stars, meteors, asteroids, comets
Dust particles, particles of cloud and gas
Ordinary matter, dark matter, leptons, photons
The energy held within all of them
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