#OnThisDay in 1930, Clyde Tombaugh discovered the ninth planet, Pluto, at Lowell Observatory. #lowel

#OnThisDay in 1930, Clyde Tombaugh discovered the ninth planet, Pluto, at Lowell Observatory. #lowel

#OnThisDay in 1930, Clyde Tombaugh discovered the ninth planet, Pluto, at Lowell Observatory. #lowellobservatory #lowell #observatory #FlagstaffAZ #flagstaff #arizona #marshill #clydetombaugh #pluto #science #space #astronomy #tbt #throwbackthursday

#lowell    #marshill    #observatory    #throwbackthursday    #flagstaff    #science    #clydetombaugh    #lowellobservatory    #arizona    #flagstaffaz    #astronomy    #onthisday    
Source Link  via  Lowell Observatory
Lowell Observatorytumblr @ lowellobservatory
Thu, 18 Feb 2016 11:03:46