Street-Badger t1_ix734ya wrote
Reply to comment by IronSmithFE in Someone tell me how the Big Bang began 13 billion years ago, yet the *observable* universe is 83 billion light years apart? by novacks0001
Space itself is expanding everywhere we look, flinging distant objects away from us faster and faster. This is called the Hubble constant. Physicists have no idea why, so they call it ‘dark energy’.
Some of what you see in the night sky is already beyond our reach forever, even if we could travel towards it at 1.0c, because the objects have accelerated away from us in the interval since the light was emitted.
Viewing a single comment thread. View all comments