The correct option is A-4, B-1, C-2, D-3
Explanation
Celestial bodies within the universe are classified based on their physical properties, such as their ability to emit light, their size, and their orbital characteristics relative to other bodies.- A. Sun (4. Star): The Sun is a star. Stars are massive, self-luminous celestial bodies made of hot gases (plasma) that generate their own heat and light through nuclear fusion. The Sun acts as the center of the solar system.
- B. Moon (1. Satellite): The Moon is a natural satellite. A satellite is a celestial body that orbits a planet. Just as planets revolve around the Sun, satellites revolve around planets. The Moon is Earth's only natural satellite.
- C. Earth (2. Planet): The Earth is a planet. Planets are celestial bodies that do not possess their own heat and light but reflect the light of a star. They orbit a star in fixed paths called orbits.
- D. Meteoroid (3. Small piece of rock): A meteoroid is a small piece of rock or metallic debris that travels through space. Meteoroids are significantly smaller than asteroids. If a meteoroid enters the Earth's atmosphere and vaporizes, it is termed a meteor (shooting star).
Key Takeaway: The fundamental distinction between celestial bodies lies in their hierarchy: Stars generate energy, planets orbit stars, satellites orbit planets, and meteoroids are smaller rocky debris moving through space.