A family who travels through time and space to rescue their dad
89070
Unknown Science Fiction Space Book
147383
Human & Alien captured, observed by higher beings
43163
Story about protagonist finding a world that has died with a museum
97727
Children's short story about material that accelerates away from gravity
6794
Book about aliens arriving in an old country; people capture their spaceship and arrive at alien's planet
66114
Time travel short story with a boy who can slip through time; gets mentored by his future self
25727
Short story about humans marooned on high gravity planet
64085
Story about a multiverse theory of immortality
131274
Earthlings create and interact with a pocket universe; universe inhabitants eventually desire to escape
34975
60s/70s movie with buggies and time-shifting protagonist
134811
Story involving teenager being recruited to travel to different worlds
80328
YA novel - kid finds some kind of time traveling creature
125571
Practical time travel: time dilation above the event horizon
69693
Story about a future with races
18011
Sci-Fi short story that involved time travel and a couple who keep losing each other
115750
Movie that had a nerd kid who goes back to Arthurian period with scientific inventions and gadgets
18962
Book about a family who can contact each-other with playing cards