Carl Sagan’s Crazy Idea: Life Inside A Comet?
Carl Sagan’s Crazy Idea: Life Inside A Comet?

http://www.universetoday.com/131934/carl-sagans-crazy-idea-life-inside-comet/amp/ “The O’Neill Cylinder lay the groundwork for space habitat design. It consisted of two counter-rotating cylinders, one nested inside…

Rosetta Archive
Rosetta Archive

http://imagearchives.esac.esa.int/index.php?/category/1 Single frame enhanced NavCam image taken on 29 September 2016 at 23:25 GMT, when Rosetta was 19.4 km from…