mars, red planet, planet
earth, planet, nature
space shuttle, rocket, lift-off
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
geometry, math, mathematics
spacex, spaceship, satellite
red blood cells, blood vessel, blood flow
valencia, spain, calatrava
