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CometsComet Quiz and Research ActivityComet PuzzleLabel the Comet PrintoutJupiter Cloze ActivityToday's featured page: The Wright Brothers Cloze Activity



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More Cloze Activities
Comet:
Cloze Activity
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Answers
Word Bank:
Halley's
km
burn
solar wind
orbits
nucleus
Sun
slows
Earth
sungrazers
atmosphere
elliptical
vaporizing
tail
gases

A comet is a small, icy celestial body that ______________________ the Sun. Comets are made up of a ______________________ (it is solid ice, gas and dust), a gaseous coma that surrounds the nucleus (it is made of water vapor, CO2, and other ______________________) and a long ______________________ (made of dust and ionized gases). The long tail of gas and dust always points away from the ______________________, because of the force of the ______________________ (a continuous stream of electrically charged particles - ions- that are given off by the Sun). A comet's tail can be up to 250 million _______________ long, and is most of what we see of the comet. Some well-known comets are ______________________, Shoemaker-Levy 9, Hale Bopp, and Swift-Tuttle.

Comets orbit the Sun in highly ______________________ orbits. Their velocity increases greatly when they are near the Sun and ______________________ down at the far reaches of the orbit. Comets are light only when they are near the Sun (when the gas is ______________________); comets are dark (virtually invisible) throughout most of their orbit. We can only see comets when they're near the Sun. Some comets crash into the Sun or get so close that they ______________________ up; these comets are called ______________________.

The ______________________ passes through the orbit of some comets. When this happens, the left-over comet comet debris (rocks, etc.) bombards the Earth, and the debris burns up in our ______________________. This is called a meteor shower; in it, many meteors fall through the atmosphere in a relatively short time.


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