The search for extraterÂresÂtriÂal life brings us right back to where we startÂed, planÂet Earth, at least for a moment. NASA researchers have disÂcovÂered eviÂdence that some buildÂing blocks of DNA, the molÂeÂcule that holds the genetÂic instrucÂtions for life, were likeÂly creÂatÂed in space and then brought to Earth by meteÂorites, leavÂing behind a “kit of ready-made parts” that conÂtributed to the oriÂgin of life. All of this gets spelled out by Dr. Michael CallaÂhan in this video released last week by NASA’s GodÂdard Space Flight CenÂter.
If you still find yourÂself doubtÂing our extraterÂresÂtriÂal oriÂgins, then chew on this more basic fact underÂscored by physiÂcist Lawrence Krauss. We are all starÂdust. Put simÂply, every litÂtle atom in our bodÂies comes from a superÂnoÂva, an explodÂing star…
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