Gavin's Miscellany
Personal encyclopedia and learning curriculum119 entries

Topic

Cosmology & Scale

The size and observable structure of the universe, kept in human-scale comparisons.

Entries

  • The Scale of the Observable UniverseThe universe is about 13.8 billion years old, but the radius of the observable universe today is roughly 46 billion lightyears, giving a diameter near 93 billion lightyears.