Most active galactic nuclei are powered by:
A) supermassive black holes.
B) a large number of supernovae.
C) mergers of compact objects.
D) black hole mergers.
E) extra-terrestrial civilizations.
A
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A scientific law is a concise statement that describes a(n) ______________ of nature
Fill in the blank(s) with correct word
The structure of most galaxies is most apparent using near-infrared images that show the locations of ____
a. dense molecular clouds b. spiral tracers c. atomic hydrogen clouds d. cool, low-luminosity stars e. hot, high-luminosity stars
If a 1 kg mass is completely converted into energy, the amount of energy released would be __________
Fill in the blank(s) with correct word
The force acting on an object is said to be conservative if the work done by this force on the object is independent of the path chosen
Indicate whether the statement is true or false