This photo shows the central region of a cluster of galaxies. Based on what you have learned from your text, which of the following statements about this photo is not true?
A) The oldest stars in these galaxies are much older than the oldest stars in our own Milky Way.
B) Half for more of the large galaxies we see in this photo are elliptical galaxies.
C) Many of the galaxies in this photo have probably suffered collisions in the past.
D) These galaxies are held together by their mutual gravitational attraction.
A) The oldest stars in these galaxies are much older than the oldest stars in our own Milky Way.
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A) A rotation curve B) A normal distribution C) The H-R diagram D) The light curve
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You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is
A) exactly 1500 N only if the box does not move. B) exactly 1500 N whether or not the box moves. C) greater than 1500 N if the box moves. D) less than 1500 N if the box moves. E) greater than 1500 N if the bat bounces back.