Of the following, which is most likely to be composed primarily of ice?

Rationale

A comet is most likely to be composed primarily of ice.

Comets are often referred to as "dirty snowballs" because they are composed largely of ice mixed with dust and other rocky materials. When comets approach the Sun, the heat causes the ice to vaporize, creating a glowing coma and often a tail, which is a defining characteristic of these celestial bodies.

A (An asteroid) YOUR ANSWER

Asteroids are primarily composed of rock and metal, with little to no ice present. They are remnants from the early solar system that did not coalesce into planets, and their composition is typically dry and solid rather than icy. Therefore, while some asteroids may contain water in the form of hydrated minerals, they do not primarily consist of ice.

B (A red dwarf) YOUR ANSWER

Red dwarfs are a type of star, composed mainly of hydrogen and helium undergoing nuclear fusion. They do not have solid or icy surfaces; instead, they are gaseous celestial bodies where ice cannot form. Thus, the notion of being composed primarily of ice does not apply to red dwarfs.

C (A comet) CORRECT

Comets are indeed composed largely of ice, including water ice, carbon dioxide ice, and other volatile substances mixed with dust and rocky debris. This icy composition is what distinguishes them from asteroids and is crucial for their behavior when they approach the Sun.

D (The planet Mercury) YOUR ANSWER

Mercury is a rocky planet with a thin atmosphere and surface temperatures that can be extremely high. While there may be ice in permanently shadowed craters at its poles, the planet as a whole is not primarily composed of ice. Its composition is dominated by metal and silicate rock.

Conclusion

Among the options provided, comets stand out as the celestial bodies most likely to be composed primarily of ice. Unlike asteroids, red dwarfs, and Mercury, which have solid, gaseous, or rocky compositions, comets are uniquely characterized by their high ice content, leading to their distinctive behavior when they approach the Sun. This icy nature is integral to their classification and understanding in the context of the solar system.

Of the following, which is most likely to be composed primarily of ice?

A comet is most likely to be composed primarily of ice.

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