Science Vocabulary Definitions Worksheet

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Nuclear Fusion

Back

The process where atomic nuclei combine to form a larger nucleus, releasing energy—how the Sun produces energy.

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**Radiation**

Back

Energy that travels through space in waves or particles, such as sunlight reaching Earth.

Front

**Solar Flare**

Back

A sudden burst of energy and light from the Sun’s surface.

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Sunspot

Back

A dark area on the Sun’s surface that is cooler than surrounding areas and part of the 11-year cycle.

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**Space Weather**

Back

Variations in solar activity that can affect Earth's space environment.

Front

Big Bang Theory

Back

The idea that the universe began as a very small, hot, and dense point and has been expanding since.

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**Red Shift**

Back

The change in the light from galaxies moving away from us, showing that the universe is expanding.

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Cosmic Microwave Background

Back

The leftover heat radiation from the Big Bang, still detectable today.

Front

Spectra (Light Spectra)

Back

The range of light emitted or absorbed by substances, used to determine composition and motion of stars.

Front

**Hydrogen & Helium**

Back

The two most common elements in the universe, predicted by the Big Bang theory.