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…

Lynds Dark Nebula 1251
Lynds Dark Nebula 1251

http://ift.tt/2dffJJG Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe…

The Andromeda Galaxy Wide Field

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