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☀️ The Sun: the engine of the solar system

Follow the Sun from hydrogen fusion and layered energy transport to magnetic activity, solar wind, auroras, and the space weather that reaches Earth.

lessons

~30 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

A star at the centerExplain why the Sun's mass, gravity, light, and variability make it the engine of the solar system.The Sun is a star whose gravity organizes the system, whose radiation powers worlds, and whose activity changes the space environment.
How the Sun makes and moves energyTrace energy from hydrogen fusion in the core through the Sun's layers to the visible surface and corona.Fusion releases energy in the core, while radiation and convection move it through layered regions before light escapes from the photosphere.
Magnetic weather from the SunConnect solar magnetic fields to sunspots, flares, prominences, coronal mass ejections, and the solar wind.Magnetized plasma makes the Sun dynamic, storing and releasing energy in the atmosphere and driving charged particles into space.
Earth inside the Sun's reachDescribe how sunlight, gravity, solar wind, and eruptions affect Earth and modern technology.Earth is protected but not isolated: the Sun sustains life, creates auroras, and sometimes disturbs satellites, radio, and power systems.

Questions this course answers

Why does the Sun dominate the solar system's motion?

The Sun contains about 99.8 percent of the solar system's mass, so its gravity controls most orbital motion.

Where does hydrogen fusion occur?

The core's extreme temperature and pressure allow hydrogen nuclei to fuse into helium and release energy.

What is the photosphere?

The photosphere is plasma, not a solid surface, and it emits most of the visible light we see.

What creates an aurora on Earth?

Charged particles guided toward the polar atmosphere excite oxygen and nitrogen, which then emit colored light.

Why can a solar flare and a coronal mass ejection have different effects?

A flare is a burst of electromagnetic radiation, while a CME is a slower cloud of magnetized plasma; they can occur together but are not identical.

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