Harpalyke (moon)

Harpalyke is a moon, which is like a mini-planet that goes around a bigger planet. Harpalyke is a moon of Jupiter, the biggest planet in our solar system! It's not round and smooth like our Moon. Instead, it looks more like a bumpy potato or a tiny, misshapen rock floating in space. It's much, much smaller than Earth's Moon, so it's hard to see without a powerful telescope.

Harpalyke takes a super long time to go all the way around Jupiter. Imagine running around a giant playground one time. Harpalyke does that, but it takes about 1.4 Earth years to finish one trip! That's longer than you've been alive! It travels very far away from Jupiter, then comes back again, over and over. It's like a tiny race car on a giant track.

Scientists think Harpalyke is made of mostly rock. It's not like Earth or Jupiter, which have lots of water and air. Harpalyke is a dry, rocky world. It's also very dark, so it doesn't shine much. It’s like a little dark pebble lost in the vastness of space. Because it's so small and dark, it's very tricky to study!

Harpalyke was discovered a long, long time ago, in 2001! That's not ancient history, but it's more recent than many other moons. It was found by a team of astronomers using big telescopes. They were looking at Jupiter and noticed this little speck moving around it. It’s named after a character from Greek stories, which is common for Jupiter's moons.