Regular sentients making a living in the void around our Sun: Earth, Luna, Phobos, and the Asteroid belt, a few years beyond the next three future pandemics.
Solar Sail ships, nuclear-powered boost-lasers, coal to process Asteroid iron to steel and fish bubbles.
No: Aliens, Monsters, blasters, pyrotechnic computers, Anti-Grav powered rockets.
Yes: Lasers, Primates, Canines, Octopus, Space Travel-Solar Sails
Travel to asteroids, Mail pouch cargo pickup, Nuclear power-driven laser launch engines, Communism, Demokratia, Capitalism, petty theft, poker, jail, and all the good things you find in space on multiple societies living on rocky asteroids.
A few family reunions, on Earth and the Asteroids, round out the journey.
Good for any reader interested in Science + Fiction who wants to live in a new world, at least for a while: high school to geriatric.