I saw a post on reddit saying NASA has a telescope that is able to see the creation of planets and stars from 13 billion years ago. How can that work?
Link to post: https://www.reddit.com/r/interestingasfuck/comments/ke2p2r/nasa_is_about_to_launch_a_telescope_that_can/?utm_medium=android_app&utm_source=share
In: Physics
Light takes time to travel. When we look at something 13 billion light-years away we are seeing what it looked like 13 billion years ago. Because 13 billion-year-old light is what we are looking at.
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