What is a gravitational lens?
A) a star that is eclipsed by one of its planets
B) a massive object that bends the space around it, causing light passing it to bend
C) an extremely massive refractor telescope
D) a lens that is affected by gravity
Correct Answer:
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Q64: Which of the following objects are difficult
Q65: The observation that outer parts of galaxies
Q66: In their search for dark matter, astronomers
Q67: Astronomers believe that dark matter exists because
A)
Q68: Astronomers believe that dark matter exists because.
A)
Q70: Why is it difficult to use the
Q71: Why do galaxy collisions lead to star
Q72: The apparent shape of an elliptical galaxy
Q73: It is expected that only elliptical galaxies
Q74: The Hubble law does not apply for
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