How have scientists mapped the surface features of Venus?
a. data received from rovers on the surface
b. data received from multiple probes sent to the surface
c. observations made from the Hubble Space Telescope
d. radar imaging by the Magellan spacecraft
e. UV imaging by the Odyssey spacecraft
Question 2
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
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