Ask Ethan #12: How far is the distant Universe? – Starts With A Bang

Ethan Siegel’s blog, Starts With a Bang, is one of the best science astrophysics blogs on the web.

Ask Ethan #12: How far is the distant Universe? – Starts With A Bang.

In this post, he tackles an issue I often see a lot of confusion over, even from science reporters.  When talking about extreme distances, to the edge of the observable universe…well, it’s complicated.  If you’re not familiar with terms like comoving distance or light travel time, or don’t understand how someone can authoritatively say that a galaxy is 33 billion light years when the age of the universe is only 13.8 billion years, then you might want to check this post out.

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