How large does the coma, or gas cloud surrounding a comet nucleus, become when it reaches its closest point to the Sun?
A) only 10 km, but it glows brightly in sunlight
B) about 106 km, as big as the Sun
C) about 108 km, close to the size of Mercury's orbit
D) about 107 km, close to 1/10 of Mercury's orbit
Correct Answer:
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