Expo/Science & Industry/Cosmos in a Computer

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Jeremiah Ostriker on-camera: text

The prior work had been almost entirely where you said there's only dark matter in the universe. So, you describe where all the points are, you calculate the gravity from those points. That gives you the acceleration that the force is on and you move them a little bit. And that's fine except the universe is not only made of dark matter. If it were we wouldn't see anything with our telescopes because dark matter is invisible. And so when you end up with computations like that you couldn't compare them to the real universe even if 90% of the matter is dark matter. You had to have the other elements in it which are things that we're actually going to see...which emit light.

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NCSA. Last modified 10/7/95.