I remember a children's book published by about 1961 in which a boy and girl who probably lived on a rocket base stowed away on an unmanned rocket to the moon.
I remember that when the newspapers revealed that they stowed away on a moon rocket various stereotypical characters read of it, including an Indian maharajah and a wealthy Mexican ranch owner.
As I remember, the maharajah marked the newspaper story with his bejeweled mechanical pencil, and the Mexican hacienda owner leaped up when he read the story and fired his silver pearl-handled pistols into the air. But I don't remember such "minor" details as the names or fate of the protagonists!
On the trip to the moon the boy looked at the sun through a telescope and when he looked away he was temporarily blind and couldn't see anything. I remember as a child thinking that looking at the sun through a telescope would likely to be instantly extremely painful to the eyes and that nobody could have forced himself to stare at the sun as long as the book said.
The moon seemed to have enough air for them to travel outside the rocket. The surface seemed to be full of ashes and they found what seemed to be a human skull in the ashes.
It was a public library book in Philadelphia read sometime between about 1958 and November 1961 when we moved away. As I remember the two children stowed away in an unmanned (but presumably designed for passengers) rocket for the first trip to the moon. When it was discovered it was a big newspaper story.
05-07-2018 Having just read Young Stowaways in Space by Richard Elam, 1960, it is not the book I asked about and doesn't have any of the incidents I remember.