Multiple Choice
What is the Oort cloud?
A) A diffuse envelope of encircling comets
B) A diffuse envelope of dwarf planets
C) A cloud of asteroids 100 000 astronomical units away from the Sun
D) A cloud of about a trillion long-period comets
E) A diffuse envelope of encircling comets and a cloud of about a trillion long-period comets.
Correct Answer:

Verified
Correct Answer:
Verified
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