My genre is science fiction.
The tropes that make Star Trek, Star Wars and other space exploration stories possible are:
Warp speed, or faster than light travel
Phaser beams, disrupters and other cool weapons
Cryogenics or stasis for long voyages without a person aging.
Different forms of alien beings
Time or travel portals: star gates
Advances in medicine
My current book serialized on this blog in previous posts, A Private Pain, uses stasis and light speed ships for hundred year voyages to set up a transportation portal for exploitation of solar systems by corporations.