Less Than Five - What is a Pulsar?

A pulsar is like a lighthouse that blinks really fast and is super far away.

Imagine you're playing with a toy boat in the bathtub. You turn on a flashlight, and it shines across the water. Now imagine that flashlight is not just a flashlight, it’s a star, and instead of being in your bathtub, it's out in space. This special star spins around like a top, and as it spins, it sends out beams of light, like the lighthouse beam.

Now here’s the fun part: this pulsar is so far away that we can only see its blinking light when it shines directly at us, just like how you can only see the lighthouse beam if it's pointing your way. Every time it spins around, we get a quick flash of light, like a super-fast blink.

Sometimes pulsars are called cosmic clocks because they’re so regular with their blinks. Scientists use them to study space and even check how fast things move in the universe!

So next time you see a lighthouse blinking on the shore, remember, it’s like looking at a pulsar from across the galaxy!