How do telescopes allow us to see back in time?
The farther away cosmic objects are, the longer it takes their light to reach us. Sunlight hitting the Earth is actually 8 minutes old by the time it reaches us. Light from the nearby Andromeda galaxy is more than 2.5 million years old. By looking at extremely distant objects, scientists learn more about what the universe was like in its early days. It’s even possible to see the afterglow of the Big Bang itself!
from The Planetary Society Articles https://ift.tt/32cOI1x
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