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Comet heads

by Lewis Carroll
written by Lewis Carroll

Comet heads are those that consist of nuclei and their gas-dust shells, which are called coma. The comet’s head is formed due to the evaporation of the dust-contaminated ice that makes up the nucleus. The degree of evaporation, and therefore the size of the coma, directly depends on the distance of the comet from the Sun. Comas begin their development when comets approach the Sun at a distance exceeding 4-6 astronomical units, and reach their maximum at perihelion. Sometimes their sizes reach a million kilometers.

Lewis Carroll writes about military space programmes, policy, technology and the industry that supports the sector. He spent nearly two decades covering the military, the Pentagon, Congress and the defence industry as a journalist for Space Chatter magazine.

Lewis Carroll writes about military space programmes, policy, technology and the industry that supports the sector. He spent nearly two decades covering the military, the Pentagon, Congress and the defence industry as a journalist for Space Chatter magazine.

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