Planet

Planet is a noun in English, meaning a large celestial body that orbits a star. It is a celestial object that is massive enough to be rounded by its own gravity, but not massive enough to cause thermonuclear fusion.

Common uses of "planet":

• Talking about the planets in our solar system:
  • Example: Mars is the fourth planet from the sun.
• Talking about planets in other star systems:
  • Example: Astronomers have discovered many exoplanets in recent years.
• Talking about the Earth as a planet:
  • Example: The Earth is a unique planet in our solar system.

Common Phrases with "planet":

• Planet Earth: The Earth as a planet.
• Planetarium: A building with a dome-shaped ceiling that projects images of the stars and planets.
• Planetary: Relating to a planet or planets.
• Extra-terrestrial: Relating to or originating from outside the Earth.

Examples:

• We live on the planet Earth.
• The planet Mars is a cold, dry desert.
• Scientists are searching for signs of life on other planets.

Notes:

• Planet can be used in singular or plural form.
• There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
• The word planet is often used in science fiction to refer to alien worlds.

Distinguish from similar words:

• Star: A giant ball of hot gas that produces light and heat.
• Moon: A natural satellite that orbits a planet.
• Asteroid: A small rocky body that orbits the sun.
• Comet: A small icy body that orbits the sun, often leaving a trail of gas and dust.