In the Tharsis region of Mars we find
A) a huge impact basin
B) heavily cratered highlands
C) smooth rolling plains
D) huge shield volcanoes like Olympus Mons
D
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The parallax shift of a star would be greater if viewed from Mars than from Earth
Indicate whether the statement is true or false
Some young star clusters contain large numbers of T Tauri stars
a. True b. False Indicate whether the statement is true or false
What keeps the surface temperatures constant all over Venus?
a. a high level of deuterium within its atmosphere b. a thick layer of water vapor just above the surface c. a greenhouse effect holding in the heat d. a slow, retrograde rotation on its axis e. a thick atmosphere and high winds carry heat efficiently
Suppose a white dwarf is gaining mass because of accretion in a binary system. What happens if the mass someday reaches the 1.4-solar-mass limit?
A) The white dwarf undergoes a catastrophic collapse, leading to a type of supernova that is somewhat different from that which occurs in a massive star but is comparable in energy. B) The white dwarf, which is made mostly of carbon, suddenly becomes much hotter in temperature and therefore is able to begin fusing the carbon. This turns the white dwarf back into a star supported against gravity by ordinary pressure. C) The white dwarf immediately collapses into a black hole, disappearing from view. D) A white dwarf can never gain enough mass to reach the limit because a strong stellar wind prevents the material from reaching it in the first place.