Dust in Galaxies Does Not Count as Dark Matter Because

question 86

Multiple Choice

Dust in galaxies does not count as dark matter because

• A) it absorbs only some wavelengths of light but not all wavelengths as dark matter does.
• B) it interacts with light.
• C) it is found only in spiral disks, whereas dark matter is also found in elliptical galaxies.
• D) dust is easily destroyed by dark matter.
• E) there is never enough to account for all the gravity in galaxies.

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