1. The Sun's Core:
- The Sun's core is incredibly hot and dense, with temperatures reaching millions of degrees Celsius.
- This intense heat and pressure force hydrogen atoms to fuse together.
2. Fusion nucléaire:
- During fusion, four hydrogen atoms combine to form one helium atom.
- This process releases a tremendous amount of energy in the form of light and heat.
3. Transport d'énergie:
- The energy generated in the core travels outward through the Sun's layers.
- It's transported by:
- Radiation: Energy is carried by photons (light particles) bouncing around.
- Convection: Hot gases rise and cooler gases sink, creating currents that carry energy.
4. The Photosphere:
- This is the Sun's visible surface.
- It's the layer where the energy reaches the surface and is released as light and heat.
5. Sunlight:
- The light we see from the Sun is a combination of all colors of the rainbow, which is why it appears white.
- The heat we feel is due to the infrared radiation emitted by the Sun.
In short, the Sun shines because it constantly burns hydrogen into helium, releasing immense energy in the process.
