Dust in galaxies does not count as dark matter because:
A) it only absorbs some wavelengths of light but not all wavelengths the way dark matter does
B) it interacts with light
C) it is only found in spiral disks, whereas dark matter is more widely distributed
D) dust is easily destroyed by dark matter
E) there is never enough to make all the gravity

Question

Quizplus · Accepted Answer

Dust interacts with light, unlike dark matter.

Dust in Galaxies Does Not Count as Dark Matter Because