“I have given them the last rites, now you do what you will. You are stronger than us, but soon I think they be stronger than you.” –Dawn of the Dead Here at Starts With a Bang, one of the things I’m passionate about is putting forth all sorts of different pieces of evidence for … Read moreA Strong Argument For The Existence of Dark Matter
The task is not so much to see what no one yet has seen, but to think what no body yet has thought about that which everyone sees. –Arthur Schopenhauer Most of you who’ve been reading Starts With A Bang for a while have seen this picture come up many, many times. Why do I … Read moreHow do we use the CMB to learn about the Universe?
“The Universe is made mostly of dark matter and dark energy, and we don’t know what either of them is.” –Saul Perlmutter When I was starting out as a graduate student, one of the most exciting (and daunting) tasks facing me was to piece together a scientifically accurate and useful picture of the Universe, including … Read moreConvincing a Young Scientist that Dark Matter Exists
“If we lived on a planet where nothing ever changed, there would be little to do. There would be nothing to figure out. There would be no impetus for science. And if we lived in an unpredictable world, where things changed in random or very complex ways, we would not be able to figure things … Read more“Your Theory Doesn’t Do Everything!” And That’s Okay.
Last year, I had just finished my Ph.D. studies, and had moved to Madison, WI to teach introductory physics at the University of Wisconsin. I was working on this paper, and when I submitted it, I got a phone call from New Scientist magazine’s space division. Fast-forward two weeks, and I find this article online, … Read moreDark Matter: Is it right in front of us?
One of the perks of being a postdoc at a place like the University of Arizona, one of the top places in the US for astronomy, is that we get a number of really interesting visitors. Today we got paid a visit by Tommaso Treu, an astronomer at UC Santa Barbara. He spoke to us … Read moreAn amazing discovery: a double Einstein Ring!
The first serious advocate of modifying Newton’s laws instead of postulating unseen (or dark) matter was Moti Milgrom, from whom today a new article appears on the astrophysics preprint archives. In particular, Milgrom asserts the following: MOND predictions imply that baryons alone accurately determine the full field of each and every individual galactic object. These … Read moreMOND vs. Dark Matter
Dave, one of my online chessplaying buddies, asked me this question (edited for appropriateness): Now this speeding up of the expansion of the universe: Do I understand correctly that one of the theories to explain why relates to “dark matter”? In real simple terms, what in the dark blue blazes is dark matter, and why … Read moreFirst question!
Taking a look at the background picture, and wondering what it is? It’s the Bullet Cluster, also known to astronomers as 1E 0657-56. What’s so special about it? Well, these are actually two galaxy clusters that are in the process of merging, and are colliding with one another! Although this is very cool (and rare) in … Read moreWhat is that Background?