Henrietta Swan Leavitt, a 19th century astronomer whose ground-breaking insights allowed us to measure the universe...

Henrietta Swan Leavitt, a 19th century astronomer whose ground-breaking insights allowed us to measure the universe will be honored by President Obama tonight (9pm EST) in his final guest presenter slot to celebrate science fair week.

You can watch the broadcast at: 
http://www.sciencechannel.com/tv-shows/science-channel-presents/news/dnews-videos/ 

Article:
http://news.discovery.com/space/history-of-space/obama-to-shine-light-on-unsung-hero-of-astronomy-160415.htm

Bio:
http://www.britannica.com/biography/Henrietta-Swan-Leavitt

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