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Cold dark matter. It can't be seen or detected by its radiation.

Some say that ranks it with Bigfoot and the Tooth Fairy!

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Why do astronomers think there is dark matter in the universe?

That is because the dark matter attracts normal matter through its gravitation.


What subsystems make up the universe?

It is theorized that dark matter makes up 80 percent of the universe. Another theory is that 68 percent of the universe is dark energy, 27 percent is dark matter, and 5 percent is baryonic matter.


Why do astronomers theorize that most of matter in galaxies and clusters of galaxies is dark matter?

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What kind of scientist studies the universe and the planets galaxies stars and other objects within it?

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