Hank explains why NASA and the European Space Agency are in love with tardigrades and how these extremophiles are helping us study the panspermia hypothesis. Follow SciShow on Twitter! www.twitter.com Like SciShow on Facebook! www.facebook.com Credits: Produced by Hank Green Chief Editor: Blake de Pastino Cinematography: Nick Jenkins Video Editor: Matt Ferguson Graphics: Amber Bushnell Written by: Hank Green TAGS: tardigrade, water bear, moss piglet, extremophile, inhospitable, environment, revive, dormant, dormancy, absolute zero, radiation, pressure, vacuum, outer space, space, NASA, european space agency, space shuttle, endeavor, TARDIS, panspermia, meteorite, science, scientists, scishow, hank green, dose