Asteroids are primarily composed of rock and metal, with varying proportions of silicates, metals, and other minerals.

M-type asteroids are known for their metallic composition, primarily consisting of iron and nickel.

Ceres is the largest asteroid in the solar system, with a diameter of approximately 950 kilometers.

Hale-Bopp is known for its exceptionally long tail, which was visible in the night sky for 18 months.

Comet tails are primarily composed of dust and gas, which are expelled from the comet's nucleus as it approaches the Sun.

Sublimation occurs when a comet passes close to the Sun, causing the ice in its nucleus to vaporize and release gas and dust.

The nucleus is the solid, icy core of a comet, which contains frozen gases, dust, and other materials.

The coma is a bright, glowing head surrounding the nucleus of a comet, which is formed by the sublimation of gases and dust.

The tail is the stream of particles and gas emitted from a comet's nucleus, which is formed by the interaction of solar radiation and the comet's atmosphere.

The halo is a faint, diffuse glow around the nucleus of a comet, which is caused by the scattering of sunlight by dust particles.

The corona is the outermost layer of a comet's atmosphere, which is composed of ionized gas and extends far beyond the visible tail.

Fragmentation is a cometary phenomenon characterized by a sudden outburst of activity, during which the comet's nucleus breaks into smaller pieces.

Disintegration is the process by which a comet's nucleus loses mass and disintegrates, often due to the intense heat and radiation from the Sun.

Outgassing is a cometary phenomenon characterized by the release of large amounts of gas and dust from the comet's nucleus, often due to the sublimation of ice.

Sublimation is the process by which a comet's nucleus releases gas and dust, often due to the intense heat and radiation from the Sun.