Multiple Choice
The gravitational lens effect has been verified by
A) observations of multiple images of the same background galaxy seen towards a massive galaxy cluster.
B) single images of highly distorted, high- redshift galaxies seen towards massive galaxy clusters.
C) observations of the bending of starlight by the Sun during a 1919 eclipse.
D) all of the above
E) None of the above; this effect is purely hypothetical.
Correct Answer:

Verified
Correct Answer:
Verified
Q43: Briefly describe two different ways of measuring
Q85: Measuring the amount of deuterium in the
Q86: The visible parts of galaxies contribute about
Q87: Based on observations of the cosmic microwave
Q88: Compared to the critical density of matter,
Q89: Measuring the amount of deuterium in the
Q91: Which galaxy rotation curve, based on hydrogen
Q92: Changing minds: From the time the idea
Q94: Spiral galaxy rotation curves are generally fairly
Q95: Refer to this scenario for the following