나사가 출처인 이미지들
1. http://commons.wikimedia.org/wiki/File:Europa-moon.jpg
3. Credit: NASA/JPL. http://commons.wikimedia.org/wiki/File:Europa_g1_true.jpg
4. Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA01669.
5 - 1 http://commons.wikimedia.org/wiki/File:PIA01130_Interior_of_Europa.jpg
6 - 2 : http://www.nasa.gov/topics/solarsystem/features/europa20130305.html
7 - 1 : http://commons.wikimedia.org/wiki/File:Cryobot.jpg
7 - 2 : http://sunearthday.nasa.gov/2010/getinvolved/aa_wu_magneticmoons.php
NASA Official: Alex Young Curator: Bryan Stephenson
그 외 출처
2 : Alien 'Big Chap' http://www.sideshowtoy.com/collectibles/alien-alien-big-chap-sideshow-collectibles-200233/
http://www.ufointernationalproject.com/latest-news/large-grey-aliens-require-full-disclosure-2015/
http://alieninvasion.org/qa-alien-alien-invasion/ http://hdw.eweb4.com/search/alien+vs+predator/
http://image.shutterstock.com/display_pic_with_logo/498883/498883,1329072085,5/stock-photo-e-t-95442940.jpg
telegraph - http://blogs.telegraph.co.uk/news/files/2013/04/et.jpg
5 - 2 : 영화 유로파 리포트의 한 장면
6 - 1 : Photo by : P. Rona - Black smoker at a mid-ocean ridge hydrothermal vent - http://www.photolib.noaa.gov/htmls/nur04506.htm
8 : Photo: Discovery Channel/Darlow Smithson Productions
9 : Image: © Adolf Schaller - http://www.daviddarling.in1fo/encyclopedia/E/Europalife.html