Chapter 1
The cosmic horizon of our sight
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Chapter 2
The shape and geometry of space
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Chapter 3
Is there an edge to everything
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Chapter 4
The expanding cosmos and cosmic speed limits
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Chapter 5
Three ultimate fates of the universe
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YOUR GOAL
Master of Is the universe infinite
Ch 4 · The expanding cosmos and cosmic speed limits
artiteacher Cosmic Expansion
We are stretching past the speed of light! (Yeah, we're flying!) / Chasing galaxies right out of sight! (Out of sight!)
Fun Fact
Stretching waves: The expansion of space actually stretches light waves, transforming energetic gamma rays from the early universe into harmless microwaves today.
Glossary
speed of light (noun)
The speed at which electromagnetic radiation propagates in a vacuum. Although space expands faster, Albert Einstein's 1905 theory defined this constant as the universal speed limit.
The speed at which electromagnetic radiation propagates in a vacuum. Although space expands faster, Albert Einstein's 1905 theory defined this constant as the universal speed limit.
Quiz
Which scientific law relates a galaxy's distance to how fast it is moving away?
Quiz
What is the name of the effect where light waves change frequency due to motion?
Quiz
What prevents objects like Earth or our bodies from expanding along with space?