More like Four Frontiers

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Space CadetNovel
Robert A. Heinleinstandalone novel1948
Military science fiction.
Starman JonesNovel
Robert A. Heinleinstandalone novel1953
Space opera, set in far future and spaceship.
“Starman Jones, a 1953 science fiction novel by Robert A. Heinlein, features a farm boy who wants to go to the stars.”
from the catalogue
Islands in the SkyNovel
Arthur C. Clarkestandalone novel1952
Set in near future and space station.
“Clarke wrote the story as a travelogue of human settlement of cislunar space in the last half of the twenty-first century.”
from the catalogue
Between PlanetsNovel
Robert A. Heinleinstandalone novel1951
Space opera, set in venus & inner planets.
“A teenager is pulled from his earthside boarding school when tensions rise between Earth and the Venus and Mars colonies.”
from the catalogue
Podkayne of MarsNovel
Robert A. Heinleinstandalone novel1963
Space opera, about political intrigue, set in near future.
“Poddy has one goal in life, to be the first female starship captain.”
from the catalogue
Time for the StarsNovel
Robert A. Heinleinstandalone novel1956
Hard science fiction, about psychic powers.
“Explorer spaceships need a way to communicate back to earth in a timely manner when they are light years away.”
from the catalogue