A comet is described as:

A comet is described as:

• A. A celestial body composed of frozen gases and rocky, metallic materials with a tail made of ionized gases
• B. A bright star that never moves
• C. A meteor that has slowed down
• D. A planet with rings

Answer: (A)

The main idea here is what defines a comet and how it behaves. Comets are icy bodies made of frozen gases mixed with rocky and metallic material. When they travel toward the Sun, heat causes the ices to sublimate, releasing gas and dust that form a visible atmosphere (the coma) and a tail that points away from the Sun. The tail—made of ionized gases and dust—is a hallmark of a comet’s activity in space. That’s why this option is the best fit: it describes a celestial body composed of frozen gases and rocky/metal materials with a tail made of ionized gases, exactly matching how comets behave when near the Sun. Other choices don’t fit because: - A bright star that never moves describes stars in the sky, which don’t form tails or have icy activity like comets. - A meteor is a small rock burning up in Earth’s atmosphere, not a distant icy body with a solar-driven tail. - A planet with rings describes a planet like Saturn, not a comet.

The main idea here is what defines a comet and how it behaves. Comets are icy bodies made of frozen gases mixed with rocky and metallic material. When they travel toward the Sun, heat causes the ices to sublimate, releasing gas and dust that form a visible atmosphere (the coma) and a tail that points away from the Sun. The tail—made of ionized gases and dust—is a hallmark of a comet’s activity in space.

That’s why this option is the best fit: it describes a celestial body composed of frozen gases and rocky/metal materials with a tail made of ionized gases, exactly matching how comets behave when near the Sun.

Other choices don’t fit because:

• A bright star that never moves describes stars in the sky, which don’t form tails or have icy activity like comets.

• A meteor is a small rock burning up in Earth’s atmosphere, not a distant icy body with a solar-driven tail.

• A planet with rings describes a planet like Saturn, not a comet.