SimilarityRank
space_travel 0.798 62675
space_science 0.752 69787
space_technology 0.705 81020
space_shuttle 0.670 81402
outer_space 0.657 45198
NASA 0.656 4997
the_International_Space_Station 0.649 61329
space_station 0.645 35861
aeronautics 0.641 90068
astronaut 0.616 16889
spacecraft 0.613 12247
on_the_moon 0.607 35559
astrophysics 0.604 46058
robotic 0.595 7859
at_NASA 0.589 84980
Apollo_[number] 0.587 62486
astronomy 0.584 10180
aerospace 0.577 18956
spaceship 0.575 40441
earth_science 0.559 46231
aviation 0.557 10123
into_space 0.557 54334
scientific_discovery 0.551 40126
Stem_education 0.550 55349
SpaceX 0.547 64263