Search PBS Space Time


2020-05-04: How We Know The Universe is Ancient

  • 01:35: ... groups of stars - other “Milky Ways”, or as Immanuel Kant called them, island universes. We now call them galaxies. It all changed in the 1920s. First Vesto ...

2020-04-07: How We Know The Earth Is Ancient

  • 03:43: ... have speculated about the existence of galaxies beyond the Milky way - Island Universes, as he called ...
  • 10:35: ... was around the same time that astronomers proved that Immanuel Kant’s Island Universes were indeed other galaxies, many millions of light years away. The world ...

2019-07-25: Deciphering The Vast Scale of the Universe

  • 01:57: The philosopher Immanual Kant guessed that theses nebulae might be entire “island universes”, of their own.
  • 02:24: But to prove that these spiral nebulae were really island universes, we needed to find their distances.
  • 04:36: ... more distance measurements it became clear that all spiral nebulae were island universes of their ...

2018-03-28: The Andromeda-Milky Way Collision

  • 09:06: Will those astronomers ever figure out that there are countless other island universes stretching across a much vaster space time?
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