Now Playing: NASA satellite images show yesterday's solar eclipse from space

Now Playing: Mom of missing sailor 'couldn't be prouder' of son

Now Playing: Family of U. of Illinois scholar presumed dead vows to press on until she's found

Now Playing: Bodies of some of the 10 missing sailors found

Now Playing: Crowds gather to witness solar eclipse in Oregon

Now Playing: The president and first lady get ready to view the total solar eclipse

Now Playing: Clouds threaten maximum totality viewing of solar eclipse in Illinois

Now Playing: Crowds at Carhenge in Nebraska eager to view solar eclipse

Now Playing: Rooftop eclipse watch party in Nashville

Now Playing: Eclipse leaves the continental US

Now Playing: How to build an eclipse viewer

Now Playing: Pets sport glasses for the total solar eclipse

Now Playing: Time lapse: A view of the total solar eclipse in Madras, Oregon

Now Playing: University of Texas removes 4 Confederate statues overnight

Now Playing: NAACP rallies to remove Stone Mountain monument

Now Playing: Everything you need to know about the total solar eclipse

Now Playing: Ohio judge shot outside courthouse, 1 suspect dead and 1 in custody

Now Playing: Counting down to the solar eclipse in Missouri

Now Playing: Sheriff visibly upset over Ohio judge shooting

Now Playing: Viewing the eclipse from Idaho Falls