Multiple Choice
Which of the following is the reason that Comet Halley is observed to be much more spectacular at some appearances than at others?
A) The size of its nucleus varies greatly from one appearance to another
B) The shape of its orbit varies greatly with time
C) Its observability near perihelion depends on the time of year
D) During some appearances it has been hidden behind other planets
Correct Answer:
Verified
Correct Answer:
Verified
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