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Out of the three, planets are far larger than asteroids or comets. The technical definition of a planet is a cosmic mass that's large enough to be rounded by its own gravity, but not so large that gravity causes extreme pressures to heat the object and turn it into a nuclear furnace (a sun).

Asteroids and comets, on the other hand, are basically chunks of matter (rock and possibly ice and gases) that remain, compared to planets, irregularly shaped.

More info: https://en.wikipedia.org/wiki/Planet

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11y ago
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11y ago

Main difference:

- Asteroids are made up of metals and rocky material

- Comets are made up of ice, dust and rocky material

Extra notes:

- Asteroids formed much closer to the Sun, where it was too warm for ices to remain solid

- Comets formed farther from the sun where ices would not melt. Comets, which approach the Sun, lose material with each orbit because some of their ice melts and vaporizes to form a tail

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10y ago

Asteroids are composed of rocky and metallic substances. Comets have some amount of rocky material but are largely composed of various forms of ice, including frozen water, frozen methane, etc. Most comets are located in the Oort Cloud, which is tremendously more distant from the sun than the asteroid belt, and hence they are extremely cold. If the orbit of a comet is perturbed so that it approaches the sun, then some of the ice of which it is composed will boil off, which produces the visible stream of gas, pointing away from the sun, which is the most distinctive feature by which comets are known, called the comet's tail.

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12y ago

It depends on the different sizes there are.

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12y ago

An asteroid is more dense because asteroids are made of solid rock, rather than a comet is made dust and ice particles which can break apart easily.

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12y ago
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8y ago

A comet is made of ice an asteroid is rock

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13y ago

ether or there is no set size

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Q: Which is more dense an asteroid or a comet?
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