Asteroids and comets both orbit the sun. While the orbits of asteroids have an eccentricity near zero, the orbits of the comets have an eccentricity closer to one. The orbits of comets are flat compare to the orbits of asteroids.
Comets are icy bodies from the Kuiper belt beyond the solar system and asteroids are solid, rocks from within the solar system usually between Jupiter and Mars.
I know asteroids come from the asteroid belt in the sun's orbit between Mars and Jupiter. Comets come from the Kiper (sic? ) Belt in the orbit between Neptune and Pluto.
Comets are covered in ice and asteroids are not.
The biggest distinction is their chemical makeup. Asteroids contain more heavy metal, whereas comets are generally more base elements, like oxygen, hydrogen, carbon, etc. Comets have higher water content, whereas asteroids have nearly none (on average). If I'm not mistaken, melpor's eccentricity details are referring to their relative orbital path.
An eccentricity closer to zero means it's a relative straight line (like a yo-yo), whereas an eccentricity closer to one is more like a circle.
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