cluster
Tag archives for cluster
It’s My ______ In A Box!
Posted by Ethan on June 15, 2012 
“I would rather be adorned by beauty of character than jewels. Jewels are the gift of fortune, while character comes from within.” -Plautus When it comes to astronomy, there’s no doubt that I’ve got a northern hemisphere bias. It’s no surprise, of course; I live here. And while I often write about the skies that…
Hole in the Universe? What Hole?
Posted by Ethan on May 20, 2008 Some of you who’ve been following astronomy for awhile might remember this report, where a group of astronomers reported finding a giant “void” in the Universe. What is a void? Well, galaxies are distributed pretty randomly, but because of gravity, they cluster together. A small example is our local group which looks like this, and…
How much better are cameras?
Posted by Ethan on March 24, 2008 Cameras, CCDs, prisms, grisms, etc., are all some of the instruments that can go on top of telescopes to help us see things better. We haven’t really increased the size of telescopes so much as we have the quality and ability of the apparatus that go atop them. Take a look at various pictures I’ve…
Say Goodbye to Virgo…
Posted by Ethan on March 13, 2008 Aaah, the Virgo cluster. A huge cluster of hundreds of galaxies, and our closest large neighbor in the Universe. People have known for a long time that although Virgo is still redshifting away from us, it isn’t quite as fast as we would expect from the Hubble expansion rate of the Universe. Does this mean…
Why we need Dark Matter in the Universe.
Posted by Ethan on February 19, 2008 Last week, Pamela Gay over at Star Stryder pointed me to a press release which claimed that, among other things, perhaps dark matter wasn’t necessary. So I wrote a guest post on her blog explaining why it was. Apparently, some people still aren’t convinced. So I will lay out for you all the reasons I…
