How Do Astronomers Know That There Is Activity in the Nuclei

question 102

Multiple Choice

How do astronomers know that there is activity in the nuclei of some galaxies?

• A)Their nuclei are much brighter than expected.
• B)The orbits of stars near the centre of the galactic nuclei are faster than expected.
• C)The luminosity of the nuclei varies over time.
• D)The colour of the nuclei is different than expected.

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