standard candle
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How Big and Bright are Galaxies?
The brightest galaxy in our night sky is the Andromeda Galaxy, our nearest intergalactic neighbor. Hey…notice we’re talking about intergalactic neighbors now? 😀 In most of the posts on this blog, we’ve talked about interstellar neighbors, interstellar space, etc. But…
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How Far Away are Galaxies?
Well, I’ll give you a spoiler: they’re ridiculously far away. Let’s consider for a moment what a light-year actually means. It sounds like a unit of time, but it’s actually the distance that light travels in one Earth year. Think…

