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The speed at which spiral galaxies rotate is often remarkably constant with increasing distance from the center of the galaxy; i.e., the galaxy's rotation curve is remarkably flat. The significance of
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The speed at which spiral galaxies rotate is often remarkably constant with increasing distance from the center of the galaxy; i.e., the galaxy's rotation curve is remarkably flat. The significance of this is that spiral galaxies contain significant amounts of ____ matter which cannot be detected using electromagnetic radiation at any wavelength.

User Vitas
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Answer:

In this question, we have to fill the blank so, the blank is Dark.

Step-by-step explanation:

Because in spiral galaxies the orbital velocity remains constant because of dark matter concentrated at the center. Then electromagnetic light can not detect them.

User Favo
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