Herschel 400 Catalogue

The Herschel 400 Catalogue is like a big list of cool things in the sky that a very smart person named William Herschel discovered by looking through a big telescope a long time ago. Imagine it's like a giant toy box full of all the best toys you can imagine, but instead of toys it's full of stars, galaxies, and nebulae (cool, colorful clouds in space!)

Imagine you are playing with your toy box and you put all your favorite toys in a special spot so you can find them easily. That's what Herschel did! He found 400 of the most special things in the sky and made a special list of them so other people could look at them too.

Many people still use this list today to look at all the cool things Herschel found. It's like they are using his special toy box to play with all the best toys, but the toys are really stars and galaxies!