Novel about a civilization escaping from their world, breaking through the alien experimnent in their silver spaceships into the alien universe
131274
Earthlings create and interact with a pocket universe; universe inhabitants eventually desire to escape
16900
A short story about finding an inhabitable planet and meeting aliens
55796
Story about space explorers who communicate but then decide they must destroy each other
88570
Sci-fi book where humanity is rebuilt on a new planet after being wiped out
37150
Sci-fi novella where colonists begin to de-evolve - Mankind has reached limits of its evolutionary cycle
11855
Hunger games style alien book
100510
Novel where a group of scientists in a spaceship encounter various aliens
110527
Sci-Fi novel that involves mind backups and (small) group minds
18832
What Sci-Fi novel is about aliens who consider it simply convenient to exterminate the human race?
118194
Looking for the title of a book about alien invasion, mining asteroids and using lasers to defend earth
101398
Book about two alien castes, alien hand modification
26391
SF Story about human adapting to alien environment
144490
'80s sci-fi novel about about an astronaut returning to Earth to find it devoid of human life
89706
Title/author of novel(s?) about society where children learn alien languages?
2832
Book series with college students finding a way to open portals to other planets
6794
Book about aliens arriving in an old country; people capture their spaceship and arrive at alien's planet
58614
Book about space alien cats