How does the Sun burn
without oxygen?

Deep inside the Sun,
conditions are extreme.

Temperature: 15 million °C
Pressure: 250 billion atmospheres

Fusion Zone
H
Hydrogen
H
Hydrogen
H
Hydrogen
H
Hydrogen

Four hydrogens float in the Sun's core.

Drag all four hydrogens
into the fusion zone.

0 of 4 atoms in fusion zone
He
Helium

Nuclear Fusion!

When hydrogen fuses into helium,
some mass is converted into energy.

This energy spreads outward as light and heat,
giving us sunlight and helping keep Earth warm.

The Sun doesn't burn—it fuses!
No oxygen needed.