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Ethan Siegel is a theoretical astrophysicist who currently teaches at Lewis & Clark College in Portland, OR. You can learn about him, contact him, or just enjoy the site.
April 8th @ 7PM -- premiere of the short film "Dark Matter", starring me, at Hollywood Theatre in Portland, OR!
July 31, 2009
Category: relativity
I get a certain question every so often, and it's one of the most difficult questions any cosmologist faces. Today, I try to tackle it. It goes something like this: If the Universe is 13.7 billion years old, and nothing...
Posted by Ethan Siegel at 3:19 PM • 103 Comments • 0 TrackBacks
July 29, 2009
Category: Stars
Sure, sure, everyone knows that stars twinkle. You look up at the night sky, and pretty much any star you look at appears to fluctuate in its brightness and intensity very rapidly, giving it a "twinkling" appearance. Why does this...
Posted by Ethan Siegel at 4:52 PM • 17 Comments • 0 TrackBacks
Category: Education
After just finishing my series on the last 100 years in astrophysics, I was surprised to read an article in Bust Magazine that seems like it ought to be from 100 years ago. You see, 100 years ago, segregating boys...
Posted by Ethan Siegel at 3:41 PM • 15 Comments • 0 TrackBacks
July 27, 2009
Category: Environment
Doomsday in 2012? Please, I don't even have time for that. (Check out Ian O'Neill's work for a nail-in-the-coffin of those myths.) But there is a big milestone that we will reach right around 2012. Prior to the industrial revolution,...
Posted by Ethan Siegel at 5:34 PM • 28 Comments • 0 TrackBacks
Category: Astronomy
I'm not responsible for this one, though! Head on over to Steinn's page, Dynamics of Cats to see this week's Carnival of Space in full. Sure, I wrapped up my series on the last 100 years, but you'll want to...
Posted by Ethan Siegel at 3:52 PM • 2 Comments • 0 TrackBacks
July 25, 2009
Category: Random Stuff
There is so much good music out there that never, ever hits the mainstream. But if you dig a little bit, you can not only find some good ones, occasionally you hit the gold mine. Such is the case with...
Posted by Ethan Siegel at 6:55 AM • 4 Comments • 0 TrackBacks
July 24, 2009
Category: Solar System
Recently, I expressed an opinion on this site in favor of a manned mission to Mars. I was met with many comments -- both positive and negative -- discussing this position. So I'd like to, first off, find out what...
Posted by Ethan Siegel at 4:00 PM • 39 Comments • 0 TrackBacks
July 23, 2009
Category: Astronomy
Battle not with monsters, lest ye become a monster. And if you gaze long into the abyss, the abyss also gazes into you. --F. Nietzsche That's supposed to be a metaphor, right? Not so, says NGC 1097. In visible light,...
Posted by Ethan Siegel at 4:56 PM • 2 Comments • 0 TrackBacks
Category: Astronomy
The last 100 years have brought us from a Universe no bigger than the Milky Way ruled by Newton's gravity to a vast, expanding one with hundreds of billions of galaxies, covered in dark matter, beginning with the big bang,...
Posted by Ethan Siegel at 4:45 PM • 15 Comments • 0 TrackBacks
July 22, 2009
Category: Astronomy
Although many of the best sites for eclipse viewing -- such as Shanghai, China -- were clouded out during this early morning, an old high school friend of mine in Taiwan had a chance to view an outstanding partial solar...
Posted by Ethan Siegel at 1:20 PM • 4 Comments • 0 TrackBacks
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