60's (or earlier) sci-fi short story about two spacecrafts exchanging plants for gold and thinking they got the better of the exchange
106721
Short story about aliens trading for hydroponics
49970
Short story sub versus a spaceship
157242
Short story about scientists who discover a way to end the world
19817
Identify a short story about a wall on a planet at the edge of a tiny universe
64745
Short story where an alien convinces a human to exchange consciousness with it
85196
1970's sci-fi short story in 4th grade reading anthology
139194
Short story about a crew finding an ancient alien ship filled with tons of artifacts from their society
116130
Novel about rendezvous with alien ship travelling through the solar system
139418
Looking for a short story about an insect-like alien captured by humans on its own planet
112532
Short story about a hole to another universe that pulls in metal
12720
Short Sci-fi story about a sentient planet/creature that exists to seed the universe with life
99076
Short story (maybe two in the same collection) about Alien education versus Earth
134874
Old story where a colonist is sent by a company to colonise a new planet where he meets a robot
85547
Does anyone remember the title of a book where single-celled organisms save some astronauts?
102347
Children's SF book about moon folk going to live on another planet
142054
Seeking title / author of a story about alien first contact with Earth
25727
Short story about humans marooned on high gravity planet