Astronomy Practice Exam 2025 – Complete Preparation Guide

Meteorites are defined as the solid fragments of stony or metallic materials that have survived their passage through Earth's atmosphere and landed on its surface. When meteoroids, which are smaller space debris typically originating from asteroids or comets, enter the atmosphere, they produce a bright streak of light known as a meteor. If they are large enough to withstand the extreme heat and pressure of this journey and actually reach the ground, they are classified as meteorites.

This definition is significant because it highlights the transformation that occurs when these space objects enter the Earth's atmosphere. Not all space debris becomes a meteorite; only those that make it to the surface after surviving atmospheric entry qualify. Thus, the option accurately captures the essence of what meteorites are and their connection to Earth's surface.

Other options present possibilities that are not universally applicable. For instance, while fragments of planets do exist, they are usually constituted by larger pieces that have more specific classifications. Similarly, the statement regarding comets implies a specific origin that doesn't encompass the broader range of meteorite origins. Lastly, although some meteorites may originate from asteroids that disintegrated upon entering the atmosphere, not all meteorites are defined by this process, making the scope of the option too narrow. The selected