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i 73 Votes Ernst Stuhlinger (1913-2008)
Why Explore Space? A 1970 Letter to a Nun in Africa | Roger Launius's Blog
Embed this infographic on your site! <iframe width="500" height="323" scrolling="no" src="http://www.numbersleuth.org/universe/magnify/" frameborder="0" allowfullscreen></iframe><br />Copyright 2012. <a href="http://www.numbersleuth.org/universe/">Magnifying the Universe</a> by <a href="http://www.numbersleuth.org">Number Sleuth</a>. The above is an interactive infographic.
Magnifying the Universe