When a comet like Comet Hale-Bopp comes closest to the Sun in its orbit, we say that it is at:
a. apogee
b. the minimum angular momentum point
c. perihelion
d. circular satellite velocity
e. the tail end of its journey
Ans: c. perihelion
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What is happening inside a star while it expands into a subgiant?
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Distinguish between fluorescence and phosphorescence