Why does a comet grow tails near the Sun?

How does sunlight turn a dark frozen nucleus into a coma with two differently shaped tails?

Follow heat into surface ice, gas and dust out of the nucleus, and solar wind along a separate ion tail.

Active comet near the Sun with a bright coma, curved dust tail, and narrow blue ion tail. — Vastward artistic reconstruction. Tail color, length, camera viewpoint, and activity are composed to make two physical processes visible.

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