President Obama speaks at the 2015 <a href="https://en.wikipedia.org/wiki/White_House_Astronomy_Night" class="extiw" title="w:White House Astronomy Night">White House Astronomy Night</a>.
<a rel="nofollow" class="external text" href="https://www.whitehouse.gov/photos-and-video/video/2015/10/20/president-hosts-astronomy-night-white-house">The White House</a>
<a rel="nofollow" class="external text" href="https://www.whitehouse.gov/photos-and-video/video/2015/10/20/president-hosts-astronomy-night-white-house">The White House</a>