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

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)

Responses

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.

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.

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.

Answer 1

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

Answer 2

is this correct

Answer 3

Yes, that is correct. Dark matter is hypothesized to be the missing mass that holds galaxy clusters together through its gravitational pull. The visible matter (baryonic matter) alone is not sufficient to provide the necessary mass and gravity.