Question

In a galaxy like the Milky Way, how much dark matter is there relative to normal matter?

Answer 1

In the Milky Way, dark matter constitutes around 90% of the galaxy's total mass, which is about nine times more than the luminous matter.

Step-by-step explanation:

In the Milky Way, dark matter constitutes around 90% of the galaxy's total mass, which is about nine times more than the luminous matter.In a galaxy like the Milky Way, there is significantly more dark matter than normal, or luminous matter. Current evidence suggests that about 90% of the mass of the Milky Way is made up of dark matter, which forms an extensive halo around the galaxy.

This means that there is approximately nine times more dark matter than luminous matter. Considering that the total mass of the galaxy is at least 2 × 10¹² solar masses (Msun), and this mass includes at least twenty times more dark matter than the luminous matter present in the stars and interstellar medium.