All-sky neutral atomic hydrogen data from the LAB survey, rendered on a globe. Different colours represent different velocity channels. It's all Milky Way gas, just as slightly different velocities from frame to frame.
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Of course you can prove a negative. In one sense this can be the easiest thing in the world : your theory predicts something which doesn...
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In the last batch of simulations, we dropped a long gas stream into the gravitational potential of a cluster to see if it would get torn... -
And more importantly, how not to build a galaxy. Uniform discs of pure gas turn out to be almost impossible. Exponential discs - where ther...
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