Final answer:
Comet tails are made of gases and dust evaporated from the comet with dust particles recoiling away from the Sun due to photon momentum transfer.
Explanation:
Comet tails are composed of gases and dust evaporated from the body of the comet and ionized gas. The dust particles recoil away from the Sun when photons scatter from them. Photons carry momentum in the direction away from the Sun, transferring some momentum to the dust particles.
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