Book trilogy(?) about advanced civilisation, wormholes and portals, first mission to Mars
2832
Book series with college students finding a way to open portals to other planets
116130
Novel about rendezvous with alien ship travelling through the solar system
123838
Book about a planet covered in very, very long necked aliens
148604
Name the book where the setting is a giant ship with a planet inside
150922
Identification of a sci-fi book or book series based on the description of two alien races
72061
Looking for a book about a crystal like prison planet
4104
Book series about a man who discovers advanced alien artifacts on the moon
126610
Series of novels involving a galactic empire in slow decline
142054
Seeking title / author of a story about alien first contact with Earth
92004
Looking for old book, SF, artificial world, different zones for different species that visitors "inhabit"
118769
Story about Missionaries on Mars
94161
Trying to remember title of a book about people on an asteroid/comet
113926
Story about a space war, and a human prisoner of war captured by alien enemy
55772
Time/space traveling story where a person travels through a portal in the London Underground
20264
SciFi book where scientists learn to peek through time (possibly controlled miniature wormhole?). Computer screens were carried like a handkerchief
156747
Book series with a double planet system and poisonous bubbles that float around
98030
Science Fiction novel or novels about starship that becomes a god, colonizes hostile planet