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What 21 stars tell us about the universe How do you whittle down the 200 billion in our Milky Way galaxy to a mere 21? Focus on the ones that have changed human understanding of the universe, as astronomer Giles Sparrow told DW. DW: Let's start with the basics: We often talk about stars in the night sky as though we could reach up and touch them. But even the nearest star to Earth is beyond our solar system — within our galaxy, the Milky Way, but almost too far to comprehend. When in writing your book A History of the Universe in 21 Stars (and 3 imposters)

Image credit: Courtesy of http://science.dodlive.mil/. From Denier on the (observable) Universe's finiteness: "I find the idea of there being a finite amount of thoughts that can occur in the universe to be a serious weight. Some really stupid things can occupy my thoughts. To think I am wasting one of the universes finite thought count on American Ninja Warrior is… awesome. After thinking about it, I’m not conserving anything. Go Jessie Graff!! You guys need to stop wasting the universes’ thoughts on your stupid stuff." When you think about it, it couldn't be any other way. To have a�...

>> welcome to "teen kids news." i'm mwanzaa. >> and i'm livia. here's this week's top story. >> so let's start with the good news. fewer teens today are smoking cigarettes or drinking alcohol. >> now the not-so-good news -- marijuana use is on the rise. >> and here's worse news. most teens probably don't realize what they're risking. scott reports. >> i wish i had an easy job like you have. >> you have the easiest job on earth. you smoke all day! >> [ laughs ] >> in the movies, getting high is often played for laughs. >> in the next couple of hours, i expect the both of us to be blit...