What Causes a Solar Eclipse and Why Does It Happen Only Sometimes?

A solar eclipse happens when the moon blocks out the sun, making it look like night during the day. But this only happens sometimes because the moon's orbit is tilted, so it doesn't always line up perfectly with the sun and Earth.

Think of the moon as a car driving around the Earth in a slightly wobbly path. Most of the time, it passes above or below the sun, so we don't get an eclipse. But every now and then, it lines up just right, and poof! We have a solar eclipse.