A group of scientists are studying observable matter in a cluster of galaxies. They conclude that the cluster has only a small percentage of the mass required to keep it from flying apart. Why does the cluster remain intact?(1 point)

Question

Responses

The orbital speed of the galaxies in the cluster is slow enough to keep the cluster intact.
The orbital speed of the galaxies in the cluster is slow enough to keep the cluster intact.

Dark matter provides the mass and gravity needed to keep the cluster together.
Dark matter provides the mass and gravity needed to keep the cluster together.

Baryonic matter provides the mass and gravity needed to keep the cluster together.
Baryonic matter provides the mass and gravity needed to keep the cluster together.

The orbital speed of the galaxies in the cluster is fast enough to keep the cluster intact.
The orbital speed of the galaxies in the cluster is fast enough to keep the cluster intact.
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Answer 1

The correct response is:

Dark matter provides the mass and gravity needed to keep the cluster together.

This option is supported by observations that show galaxy clusters contain significantly more mass than can be accounted for by visible (baryonic) matter alone. Dark matter is believed to make up a substantial portion of the total mass in the universe, providing the additional gravitational pull necessary to prevent the cluster from flying apart.