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Is the universe infinite
5 chapters
70 assets
by teacher · 10 jul 2026
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Chapter 1
The cosmic horizon of our sight
1
The speed of light limits our vision
2
Measuring the observable universe today
3
The cosmic microwave background barrier
4
Ancient perspectives on cosmic limits
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Chapter 2
The shape and geometry of space
1
Three possible shapes of the cosmos
2
Measuring cosmic lines with triangles
3
The critical density of space
4
The torus and wrap-around universes
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Chapter 3
Is there an edge to everything
1
The paradox of the cosmic edge
2
Finite but unbounded spaces
3
The multiverse and bubble worlds
4
What lies beyond our cosmic horizon
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Chapter 4
The expanding cosmos and cosmic speed limits
1
Edwin Hubble and the runaway galaxies
2
Space is stretching, not flying
3
Breaking the cosmic speed limit
4
The cosmological redshift explained
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Chapter 5
Three ultimate fates of the universe
1
The mysterious force called dark energy
2
The Big Freeze and cosmic isolation
3
The Big Rip and shredded matter
4
The Big Crunch and cosmic rebound
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