Definition

1. Noun:
   • A celestial object: A relatively small body in space, composed of ice, dust, and rocky material, that orbits the Sun.
   • Characterized by a visible atmosphere and tail: When a comet approaches the Sun, heat causes its icy core to vaporize, releasing gas and dust that form a glowing head (coma) and often one or two tails that point away from the Sun.

Usage Examples

• Noun:
  • Halley's Comet is visible from Earth approximately every 76 years.
  • The astronomer discovered a new comet using a powerful telescope.
  • A bright comet with a long tail was spotted in the night sky.

Advanced Usage

• "Comet of the century": A term used for a comet that becomes exceptionally bright and spectacular.

  • The news media dubbed it the comet of the century, drawing crowds of stargazers.

• "Comet hunter": An astronomer or amateur who searches for new comets.

  • She became a famous comet hunter after discovering several new objects.

Variants and Related Words

• Cometary (adj): Relating to or resembling a comet.

  • The telescope captured detailed images of the comet's cometary nucleus.

• Coma (n): The nebulous envelope of gas and dust surrounding the nucleus of a comet.

  • The comet's coma grew larger as it neared the Sun.

Synonyms

• Ice dwarf: (Informal/less common) Sometimes used to describe small icy bodies in the solar system, though this is not a precise synonym.
• Wanderer: (Archaic/poetic) An old term reflecting the unpredictable appearance of comets in the sky.

Related Phrases

• "Dirty snowball": A colloquial term describing the composition of a comet's nucleus (a mixture of ice and dust).

  • Scientists often describe a comet's core as a dirty snowball.

• "Comet tail": The stream of gas and/or dust that extends from the comet's head.

  • The solar wind causes the comet's tail to always point away from the Sun.

Idioms

• "Like a comet": Used to describe something that appears suddenly, is brilliant or spectacular, and then disappears or fades quickly.
  • Her rise to fame was like a comet—bright, brief, and unforgettable.

Noun

1. (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit