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

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.

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 fast enough to keep the cluster intact.
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 slow enough to keep the cluster intact.

Answer 1

The correct response is:

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

Dark matter does not emit light and is not directly observable but is thought to make up a significant portion of the total mass in galaxy clusters, providing the additional gravitational force necessary to keep the cluster intact despite the observable matter being insufficient.