Two Earth-explorers encounter aliens, learn Earth had lost war in past; aliens thought humans were extinct
16900
A short story about finding an inhabitable planet and meeting aliens
148202
How to explain the discrepancies between the end of Prometheus and the beginning of Alien?
46628
A story about a whole crew of aliens who visit Earth, befriend a child
64745
Short story where an alien convinces a human to exchange consciousness with it
24884
Story ident : Solar powered aliens
29260
Two spacecraft pilots travel at light speed, meet back on Earth in different era due to time dilation
143007
Book with travellers, alien artefacts and age reversal
152012
Post Apocalyptic Series With Alien Species
118769
Story about Missionaries on Mars
147383
Human & Alien captured, observed by higher beings
151557
A man who sometimes works for the UN accidentally sells the Earth to an alien
13402
Aliens abduct mathematician, astronomer, woman
35351
2 War machines survive the destruction of humanity, try to build a robot to repair themselves
42114
Short Story: Explorer crash–lands on uncharted planet, is stripped of technology and observed by alien?
94172
Science Fiction story about humans escaping earth's destruction
55796
Story about space explorers who communicate but then decide they must destroy each other
133477
Exploration teams land on planet and die of nightmares