Which best describes Mercury's plains?
a. heavily impacted with craters and large rays
b. solidified lava flows that are a uniform gray color
c. a geologically active surface of molten lava
d. solidified lava flows rich in dark basalts
e. a rich layer of soil containing iron and silicate
Question 2A planetary nebula is a(n) ____.
a. expanding envelope of ionized gas expelled by a dying medium-mass star
b. expanding envelope of neutral gas and dust expelled by a dying medium-mass star
c. contracting envelope of dusty material from planets destroyed by a dying medium-mass star
d. contracting envelope of ionized interstellar medium absorbed by a dying medium-mass star
e. expanding atmosphere of a medium-mass star as it becomes a red giant
Question 3Which mission has recently provided scientists with information about Mercury's magnetic field?
a. Magellan
b. MESSENGER
c. LCROSS
d. Voyager
e. Apollo
Question 4The evolution of a medium-mass star like the Sun, when off of the main sequence, is ____.
a. strongly affected by mass absorption from the interstellar medium
b. strongly affected by mass absorption from the corona
c. not affected by mass loss due to increased solar winds
d. strongly affected by mass loss due to increased solar winds
e. strongly affected by mass loss due to hydrogen fusion
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