Astronomy Practice Exam 2026 – Complete Preparation Guide

Question: 1 / 460

Which process involves the fusion of hydrogen nuclei to form helium nuclei?

Thermal conduction

Nuclear fusion

The process that involves the fusion of hydrogen nuclei to form helium nuclei is known as nuclear fusion. This fundamental reaction is the primary mechanism that powers stars, including our Sun.

In nuclear fusion, two hydrogen nuclei (which are essentially protons) collide at high temperatures and pressures, such as those found in the core of stars. Under these extreme conditions, the kinetic energy allows them to overcome their natural electrostatic repulsion and come close enough for the strong nuclear force to take effect, resulting in the formation of a helium nucleus. This process also releases a significant amount of energy in the form of radiation, which is what makes stars shine.

Understanding nuclear fusion is crucial when studying stellar evolution and the lifecycle of stars, as it ultimately leads to the production of heavier elements and the release of energy that supports life on planets like Earth.

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Electron transition

Radioactive decay

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