nasahistory:Happy Birthday Carl (1934 - 1996). Your legacy continues to shine.
nasahistory:Happy Birthday Carl (1934 - 1996). Your legacy continues to shine. -- source link
Tumblr Blog : thebeautifulcosmos.tumblr.com
#carl sagan#science
nasahistory:Happy Birthday Carl (1934 - 1996). Your legacy continues to shine. -- source link
Tumblr Blog : thebeautifulcosmos.tumblr.com