Which of the following is the centerpiece in the unified model of active galactic nuclei (AGN) and quasars?
A) A blue giant
B) An accretion disk
C) A torus
D) A black hole
D
You might also like to view...
Uniform Circular Motion: The curved section of a horizontal highway is a circular unbanked arc of radius 740 m. If the coefficient of static friction between this roadway and typical tires is 0.40, what would be the maximum safe driving speed for this horizontal curved section of highway?
A. 54 m/s B. 52 m/s C. 50 m/s D. 48 m/s E. 46 m/s
Improvements in technology will eventually allow the entire electromagnetic spectrum to be observed from high mountaintop observatories
Indicate whether the statement is true or false
What element are white dwarfs made of? Why?
What will be an ideal response?
The first law of thermodynamics states that heat added to a closed system can change the internal energy of the system and/or do ______________
Fill in the blank(s) with correct word