Children's book-a boy explores the solar system
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Came w/ cassette audiobook, and is a picture book.
A boy gets a robot kit, the robot grows, turns into a spaceship and takes the boy on a tour of the solar system. Read it over and over again as a kid and would love to pick it up for my son. Thanks for any help!
Adventures Beyond the Solar System: Planetron and Me by Geoffrey Williams?
"Planetron, the transformer robot turned spacecraft, speeds Will on an exciting journey into the far reaches of our galaxy where he learns a great deal about astronomy." There is a version that came with a cassette tape according to Amazon reviews.
Edited to add cover from Amazon:
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