Download or read book Astrotwins -- Project Blastoff written by Mark Kelly and published by Simon and Schuster. This book was released on 2016-03 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Young Mark Kelly and his brother and friends decide to build a rocket over the summer when their constant bickering starts to annoy their grandfather in this middle-grade novel based on the NASA astronauts' real childhoods"--