GED Science Practice

What is an asteroid?

1. The whole mass of gases surrounding a planet

2. The breaking down of an atomic nucleus into two or more parts with a great release of energy

3. One of a group of "minor plants" between Mars and Jupiter

4. Process by which digested food is utilized by the body to build up or repair cells

The correct answer is: One of a group of "minor plants" between Mars and Jupiter

An asteroid is best described as one of a group of "minor planets" that orbit the Sun, primarily found in the region between Mars and Jupiter known as the asteroid belt. These celestial bodies are composed mainly of rock and metal, and they vary in size from small boulders to larger objects that can be hundreds of kilometers in diameter. The distinction of asteroids as minor planets highlights their role within our solar system, where they are considered remnants from the early formation of planets and are significant for studying the conditions of the early solar system. The other contexts provided do not accurately define an asteroid. For instance, the description regarding the mass of gases around a planet pertains more to a planet's atmosphere. The breaking down of an atomic nucleus refers to nuclear fission, which is unrelated to the physical characteristics of asteroids. Lastly, the digestion process described relates to biology and nutrition rather than astronomy. Understanding asteroids expands our knowledge of planetary formation and the dynamic processes at play within our solar system.