The Sun
The Sun introduces students to essential astronomy ideas through observation, evidence, vocabulary, and real examples.
A Working Star
The Sun is a middle-aged main sequence star that converts hydrogen into helium in its core. That nuclear fusion releases the energy that warms Earth, powers weather, and supports nearly every food chain.
Layers and Activity
Its visible surface is the photosphere. Above it are the chromosphere and corona, where magnetic fields twist plasma into loops, flares, and coronal mass ejections.
Did You Know?
The Sun connects to everyday science because the same laws of motion, energy, and matter apply on Earth and across space.
Knowledge Check
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