mars, red planet, planet
space shuttle, rocket, lift-off
earth, planet, nature
mountains, man, cross
alien, robot, android
spaceship, ufo, science fiction
sun, star, planet
mite, aceria anthocoptes, acari
ufo, extraterrestrial, spacecraft
knowledge, book, library
pill, capsule, medicine
analysis, biochemistry, biologist
spacex, spaceship, satellite
geometry, math, mathematics
red blood cells, blood vessel, blood flow
valencia, spain, calatrava
