I don't know either (:
Celestial comets is a more formal name for comets. Comets are objects in space orbiting the Sun with long orbits. They are thought to be made of frozen water. As they near the Sun they produce a long glowing tail trailing behind.
The craters on the moon were formed by the impacts of asteroids and comets.
Andromeda is a constellation, but because one of the best-known and most-photographed galaxies is M31, the "great nebula in Andromeda", the name is often used to refer to the galaxy. Charles Messier was a French astronomer who was a fanatic about comets. Most of his astronomical observations were done while hunting for comets. But there are a lot of faintly bright fuzzy things in the sky that are NOT comets, and Messier achieved lasting fame for his list of things that look like comets but are not comets. M31 is "item number 31" in Messier's list of fuzzy things that aren't comets.
There is not a name of a song that goes "think of the good times, leave the chairs behind". There is a song that goes "think of the good times, leave the cares behind". The song is called "Chic".
The white trails left behind jets are known as contrails.
Ectoplasm
See related link for a list of periodic and non periodic comets.
hadeodysessus
Keys
asteroids
Haley's
They mostly got bigfoot's name from the 2-5 feet tracks his giant feet leave behind.