Tethys (moon)

Tethys is one of Saturn's many moons, and it's the fifth biggest! It's a giant ball of ice, so much ice that it's lighter than water. Think of it like a giant snowball floating in space. It's super bright, almost like a shiny disco ball, and it's the second brightest moon of Saturn. It's a very old moon, and its surface is covered in bumps and cracks from when it was forming.

Tethys has some amazing features! There's a crater called Odysseus that is so big, it's almost as wide as the moon itself! Imagine a crater so large it could swallow your whole city.

Then there's Ithaca Chasma, a giant crack in the moon's surface that is longer than many countries are wide. This giant canyon might have been made when Tethys was much younger and hotter, and the ice inside it was still melting.

A smart astronomer named Giovanni Domenico Cassini discovered Tethys way back in 1684. That's a super long time ago, even before your grandparents' grandparents were born! He was looking at Saturn and its moons with his telescope. Tethys is named after a giant from old Greek stories called Tethys. It's like giving a special name to a special place in space!

Even though Tethys is super far away, brave space probes have flown by to take a peek! Pioneer 11 and the Voyager missions zipped past it a long time ago. But the Cassini-Huygens spacecraft got to spend a lot of time exploring Tethys between 2004 and 2017. It took amazing pictures and helped us learn all sorts of cool things about this icy moon.