How Does the Aurora Borealis Form?

The Northern Lights happen when particles from the Sun zoom into Earth’s atmosphere and dance with gases up high.

Imagine you're playing tag in a big park. The Sun is like the person who starts running, sending out particles, which are like tiny runners. These little runners travel through space for days or even weeks before they reach Earth. When they get close enough, they bump into gases in Earth's atmosphere, kind of like when you crash into a friend during tag.

These bumps make the gases light up and glow, just like how your face might light up when you laugh really hard! The colors depend on which gas is hit: green from oxygen, red or purple from nitrogen. It’s like having different colored balloons pop in the sky!

Why it happens only sometimes

Not all days get the Northern Lights. It's like needing both a strong runner and a good spot to play tag, you need a strong solar wind (like a really fast runner) and some gases up high (a nice open field). When those two things meet, poof, lights in the sky!

Take the quiz →

Examples

  1. A child sees the sky glow with shimmering colors and wonders how it happens.
  2. A teacher explains that lights from space are bouncing off Earth's magnetic field.
  3. A simple diagram shows solar wind hitting Earth's atmosphere.

Ask a question

See also

Discussion

Recent activity