It sounds to me like you are talking about Eleanor Cameron's books about "The Mushroom Planet." The first is called "The Wonderful Flight to the Mushroom Planet," and the second is "Stowaway to the Mushroom Planet." The books feature a rather egg-headed scientist named Tyco Bass, and two young boys, David and Chuck. In the first book, Bass puts a notice in the paper for two boys to build a small space ship, and David responds to the ad. He and his friend Chuck end up going to "The Mushroom Planet," which is hidden within our own solar system. I remember the books as being truly wonderful and inventive.
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