#lookback-time

[ follow ]
#cosmic-expansion #redshift #spectroscopy #finite-speed-of-light #relativity #voyager-1
Science
fromBig Think
3 hours ago

How are redshift, temperature, distance and time related?

Cosmic expansion decouples redshift, temperature, distance, and lookback time for objects beyond gravitationally bound regions, complicating their interrelations.
fromBig Think
1 month ago

What do distant observers see when they look at Earth?

When you view anything at all in the Universe, you're not seeing it precisely as it is right now: at the moment you experience seeing it. The speed of light, even though it's the fastest speed that any signal can travel throughout the Universe, is still finite. No matter how close or distant an object is, you're only seeing it as it was a particular amount of time ago: at the moment the now-arriving light was emitted from the object you're observing.
Science
[ Load more ]