Dark Matter Haters to the Left
September 5, 2011 2:40 PM Subscribe
When we talk about dark matter and its alternatives, we are talking about no less a task than explaining the structure of every large object in the Universe. On the largest scales dark matter blows all of its competitors away. In terms of explaining the large-scale structure of the Universe, not a single one of dark matter's alternatives comes close to mirroring its success. But of course, that doesn't stop the sensationalist headlines from rolling in. We are understandably uncomfortable with the notion that we are not the most important thing in the Universe. We've just successfully figured out where the new material to form the Milky Way's young stars is coming from: high-velocity intergalactic gas clouds! About a Sun's worth of gas falls into the Milky Way (on average) every year, and this resupplies the Milky Way's gas reserves, which get eaten up as new stars form over billions of years. But what about the other, larger mystery? What about reproducing the structure of the Milky Way itself?
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