Why are galaxy collisions of interest?
A. Collisions are extremely rare.
B. Collisions and mergers play an important role in shaping galaxies.
C. Collisions generate hundreds of black holes.
D. Collisions have a strong effect on the evolution of stars.
Answer: B
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What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?
What will be an ideal response?
A galvanometer can be calibrated to measure
A) electric current. B) electric voltage. C) both of these D) none of these
The curvature of spacetime around a black hole is so extreme that outward-going signals cannot escape
Indicate whether the statement is true or false