The "wispy terrain" on Rhea was revealed by the Cassini spacecraft to be:
A) ice cliffs created by tectonic fractures.
B) water ice flows from past impacts that cracked its icy surface.
C) the icy ash of water volcanoes.
D) "maria" created during the period of high impacts.
E) water ice flows from geyser-like activity.
A
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If dark nebulae are really dark, how do we know they are there?
What will be an ideal response?