Do you know which one is Saturn?
How can I get to Saturn?
I’m an alien from Saturn.
The ground star is Saturn. That's why it's called "sat"urn. Because the first people to find it sat on the ground there. It's a star made completely of sit-on-able ground.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.