Class 8 Science | Comets

Science and Technology, Class 8: Earth and Universe

Comets

A body of ice, dust and gas · Nucleus, coma, two tails · A highly elliptical orbit

Structure

The Three Parts of a Comet

NUCLEUS

The frozen solid centre. It is always there.

COMA

The cloud like shell of vapour and gas that solar heat raises round the nucleus.

TAIL

The long bright part made when the solar wind blows the coma material out.

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Presenter notes: Ask the class who has heard of or seen a bright object in the sky with a long tail. That object is today's lesson.