interplanetary travel
Martians
Venerians
alien invaders of Earth
future history
generation ships
longevity
relativistic interstellar travel
faster than light interstellar travel
future religions
magic as technology
time travel
telepathy
extrasolar aliens
future military conflicts
interstellar civilizations
Then reflect on genres that Anderson wrote that Heinlein didn't.
This is an exercise for someone else!
(You can see that I am trying to devise easy posts for today.)
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