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  1. Asteroid - Wikipedia

    An asteroid is a minor planet —an object larger than a meteoroid (thus 1 meter or larger) that is neither a planet nor an identified comet —that orbits within the inner Solar System or is co …

  2. Asteroid | Definition, Size, & Facts | Britannica

    Dec 24, 2025 · Asteroid, any of a host of small bodies, about 1,000 km (600 miles) or less in diameter, that orbit the Sun primarily between the orbits of Mars and Jupiter in a nearly flat ring …

  3. Asteroids - Science@NASA

    Apr 25, 2025 · Asteroids, sometimes called minor planets, are rocky, airless remnants left over from the early formation of our solar system about 4.6 billion years ago. Most asteroids can be …

  4. ASTEROID Definition & Meaning - Merriam-Webster

    The meaning of ASTEROID is any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter. How to use asteroid in a sentence.

  5. ASTEROID Definition & Meaning | Dictionary.com

    Any of numerous small solar system bodies that orbit the Sun primarily in the asteroid belt, a region between the orbits of Mars and Jupiter. Asteroids are intermediate in size between …

  6. Asteroid Definition - Intro to Astronomy Key Term | Fiveable

    An asteroid is a small, rocky body that orbits the Sun. Asteroids are remnants of the early solar system and provide valuable insights into the formation and evolution of our planetary system. …

  7. Asteroids - Definition, Examples, Quiz, FAQ, Trivia

    Asteroids are rocky objects that orbit the Sun, mostly found in the asteroid belt between Mars and Jupiter. They're sometimes called minor planets or space rocks.