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Question 1:
Why is Comet Holmes different from many other short-period comets?
Answer:

Many comets lose ice particles when they travel close to the Sun. Comet Holmes, however, appears to have ejected chunks of ice when it was moving away from the Sun. The comet had a similar outburst more than 100 years ago

Comet Holmes is a member of the Jupiter family of comets, which orbits between Jupiter and the Sun. Asteroids also follow a similar orbit. Most of the Jupiter-type comets orbit the Sun every 20 years or so. Comet Holmes, however, orbits the Sun every seven years. Other short-period comets complete trips around the Sun roughly every 20 to 200 years.

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