Years ago, maybe '80s-'90s, I read what I remember as a short story.
It was about an Earth crew stationed on a planet near the edge of our solar system. A sun appeared at the edge of our solar system, then disappeared and reappeared. The crew named the sun "Ronin." The members decided to hitch a ride with it the next time it appeared.
When they did, it took them to alternate versions of our solar system. One was silicon-based. There, they came in contact with a jellyfish-like race living in the upper atmosphere of Jupiter. A Jovian ship was coming to greet them until they realized that in this solar system, they were food to the jellyfish-like race. They had to escape, but the Ronin sun did not have a regular cycle. Of course, it appeared just in time.
This short story might have been in a paperback anthology. I remember paperback, but a lot of my sci-fi is in paperback.