How does a lunar eclipse happen and why is it sometimes red?

A lunar eclipse happens when Earth comes between the Moon and the Sun, blocking sunlight from reaching the Moon.

Imagine you're playing with your friend in a big room. The Sun is like a bright lamp on one wall, you are Earth, and your friend is the Moon. When you stand between your friend and the lamp, you block the light, that’s like an eclipse!

Sometimes the Moon looks red during an eclipse, like it's wearing a red hat! This happens because Earth’s atmosphere acts like a filter. The air scatters blue light, leaving mostly red and orange light to reach the Moon. It's similar to how the sky turns red at sunset, the same kind of light reaches your eyes then too.

So during a lunar eclipse, the Moon can be red or dark, depending on how much light gets through Earth’s atmosphere, it's like a fun color change in the sky!