What I enjoyed even more than the space travel was the exquisite attention to period detail in the book. Clearly, Kelly remembers details like the price of gas (57 cents a gallon!), what was on t.v., the things the family ate, and the general pace of life. There's even a delightful interchange when the twins want to call Egg, but know their mother won't want to spend the money to call "long distance". Today's readers will definitely learn a lot about what life was like in the 1970s!
There are really no other middle grade books that present kids taking off into space, but readers who are science fiction fans or deeply interested in science will find Astrotwins a fun fantasy read. Who doesn't want to travel into space with a blenderized peanut butter and jelly sandwich as a snack?