The cosmic horizon of our sight
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The shape and geometry of space
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Is there an edge to everything
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The expanding cosmos and cosmic speed limits
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Three ultimate fates of the universe
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YOUR GOAL
Master of Is the universe infinite
artiteacher The Edge of the Universe
There's no boundary wall and no center in sight, We are just in a bubble of far-travelled light.
Archytas's spear: Archytas of Tarentum used a simple thought experiment with a spear in 400 BCE to argue that space must go on forever.
The portion of the cosmos that can be seen or detected from Earth. In 2013, the Planck satellite refined this visible boundary to approximately forty-six billion light-years.
Which of the following would be required for a universe to have a literal physical wall?
What is likely true about the region of space just outside our observable horizon?
What do scientists call the hypothetical collection of multiple co-existing universes?
Which concept describes a space that has a limited volume but no physical boundary or wall?
Who proposed the ancient thought experiment of throwing a spear at the edge of the universe?