Question: among the questions that always has continued to be unanswered come me is the following. Once we see the stars top top naked eye or by telescopes, those space obviously numerous light years away from us, yet do we watch them live or is it the irradiate from several years back? — Sami

Answer: In fact, the answer is in the remarkably convenient street unit that you referred to above: “light year”. A irradiate year is the street that light can travel in one year. So, if a star is one irradiate year away, the light the it emits take away one year to get to us. For that same star that is one irradiate year away, if that suddenly started to glow brighter one day, we would actually watch that brightening till one year later.

You are watching: How old are stars we see

Jeff Mangum


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