Starship Asterisk*

Thanks. Not being an astronomer I've never done trig on this scale. So 30 arc-minutes is half a degree, and at 60 Million light years, that arc would span about half a million light years. Which makes this structure rather large. Going back and looking at the APOD I see that it tells me all of this,...

Sorry for the banal newbie post, but I have young children who I am trying to interest in Astronomy and science in general. They love the pictures, but it is usually very difficult to put them in perspective. For example, today's APOD of "The Antennae" in Corvus. It is, as usual, an amazin...