Comet

A celestial object consisting of a nucleus of ice and dust, and, when near the sun, a “coma” (or atmosphere) and a tail. The nucleus is a relatively small, solid body, composed mainly of frozen gases such as methane, ammonia, and water, mixed with dust particles. As a comet approaches the sun, the heat causes these ices to sublimate, forming a glowing coma around the nucleus and a tail that always points away from the sun due to solar wind pressure and radiation. Comets are remnants from the early solar system and offer clues about its formation.

Comet meaning with examples

• The astronomer pointed out the stunning sight of the Hale-Bopp comet in the night sky. Its bright, elongated tail was a spectacle, a natural light show that captivated everyone observing. It was an unforgettable experience to see such a celestial wonder.
• Ancient civilizations often viewed the sudden appearance of a comet as a harbinger of significant events. They didn't have the scientific understanding to appreciate its orbit, they often believed it foreshadowed disasters.
• Scientists study the composition of **comets** to understand the origins of the solar system and the building blocks of life. Their icy interiors are like time capsules, holding information that stretches back billions of years.
• The comet's trajectory took it on a long, looping orbit around the sun. This was a rare occurrence and one many were excited to see it so clearly.
• The impact of the comet could have led to mass extinctions in Earth's past. The study of craters gives scientists more information about such significant impacts.