Tangential comment, but it’s crazy to think about how, when we look up at the stars in the sky, we’re seeing light in
wildly varying degrees of age.
For example, when we look at the sun, that’s 8-minutes-old light. When we look at Polaris (the North Star), that light is 447 years old.
When we look at Andromeda?
Yeah, that light is 2.5 million years old.