Observations show that the universe is populated with some unseen form of matter — and plenty of it.
Astronomers might be more confident about their picture of the universe were it not for dark matter. Observations show that the universe is populated with some unseen form of matter — and plenty of it. Astronomers attempt to “weigh” the universe in a variety of ways. They observe the effects of dark matter on astronomical objects that vary from small to large.
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