Back in the 1960s I read a series of science fiction books for children. They dealt with a project about sending spaceships (that looked very much like flying saucers) to the moon. At some stage, two of the spaceships were filled with oxygen and deliberately crashed on the moon, thus giving it an atmosphere that humans could breathe (no kidding!).
The hero of the books was a boy who also got to the moon.
If I remember correctly, two of the spaceships were called "Cephesus" and "Daner" or something like that.
Can anybody tell me the title and/or author of these books?