Sagot :
Answer:
a. An icy object that gravity or a collision pushes close to the Sun.
Explanation:
Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. ... When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets.
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