What are planetary nebulae?

Planetary nebulae are glowing clouds made from gas and light left behind by stars.

Imagine your favorite toy, maybe a big plush bear that you've had for years. When it gets old, you might take it apart to see what's inside: stuffing, fabric, maybe some buttons or thread. A planetary nebula is kind of like that bear, but way bigger and in space. It’s what happens when a star, like our Sun, grows older and starts to let go.

Stars are like big, bright balls of fire. When they get old, they puff out their outer layers, like blowing up a balloon, leaving behind a hot, glowing core. This leftover gas glows brightly because it’s lit up by the core, creating something that looks like a beautiful, colorful cloud in space.

Planetary nebulae can look like rings or butterflies when we see them from Earth. They’re not planets, they just look a bit like them, which is why scientists call them planetary nebulae.

Sometimes you might even see one with the naked eye, especially if it’s close to us! It's like having a tiny, glowing fireworks show in the sky.