Weird shit hard sf: Margaret Simpson, Strange Orbit. Scholastic (AdLib), London: 1992.
Jessica Baron, daughter of a Physicist father and a New Age mother, wins a trip on a rocket ship along with four other kids. It's led and paid for by an eccentric female millionaire.
Part one of the book has Jessica explaining lots of cool science to us and siding with her Dad.
Part two of the book the ship slips out of the universe into Eternity where they meet Schroedinger's Camel, an Eastern mystic and send telepathic messages to loved ones (Mom recieves it, Dad doesn't) Jessica begins to side with Mom and brother Steve.
Part three, they land on Titan where they meet the Shantih Yogi Baba (Steve has given Jessica his photo to carry) and who has made his presence felt first as an Eastern Metatron.
They get home. It's all true.
Never before have I seen someone try to combine hard sf with hippy shit. It almost works.