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Astronomy's decades-long quest to understand cosmic topology

If some aspects of cosmic topology turn out to be true, the idea that starships might voyage across the cosmos for hundreds of thousands of light-years without ever returning to the same neck of spacetime could be problematic.

Astronomy's decades-long quest to understand cosmic topology

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Fall Equinox 2026: When Is the First Day of Autumn?

As summer winds down, the seasonal shift officially arrives with the fall equinox, marking the beginning of astronomical autumn.

  • Autumnal equinox occurs on September 22, 2026
  • Marks start of astronomical autumn in Northern Hemisphere
  • Day and night lengths become nearly equal

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