Joseph Jeffries, 7, front, and his mom Betsy Jeffries (l.), of Beaverton, Ore., look as the solar eclipse Sunday evening May 20, 2012 in Portland, Ore. OMSI and Rose City Astronomers Club hosted an eclipse viewing party for the eclipse. Faith Cathcart/The Oregonian/AP
A business man watches an annular solar eclipse at a waterfront park in Yokohama, near Tokyo, Monday, May 21, 2012. Millions of Asians watched as a rare "ring of fire" eclipse crossed their skies. The annular eclipse, in which the moon passes in front of the sun leaving only a golden ring around its edges, was visible to wide areas across the continent. Shuji Kajiyama/AP
People observe the solar eclipse Sunday, May 20, 2012 in Chico, Calif. The annular eclipse was visible to wide areas across China, Japan and elsewhere in the region before moving across the Pacific to be seen in parts of the western United States. Ty BarbouThe Chico Enterprise-Record/AP
A dog is seen wearing a solar viewer during an annular solar eclipse at a temporary shelter for evacuees from last year's Fukushima nuclear disaster, in Koriyama, Fukushima prefecture in this photo taken by Kyodo May 21, 2012. Reuters
A tourist watches an annular eclipse through a solar viewer in Monument Valley Tribal Park in Utah May 20, 2012. Gene Blevins/Reuters
A thundershower rolls through as an annular solar eclipse appears in Gardnerville, Nev., on Sunday, May 20, 2012. Cathleen Allison/AP
A South Korean astronomy student uses special sunglasses to observe an annular solar eclipse in Seoul, South Korea, Monday, May 21, 2012. Lee Jin-man/AP
School students watch an annular solar eclipse projected through a telescope on the white screen in Kaizuka, Osaka, western Japan Monday, May 21, 2012. AP
The moon begins to partially block the sun as the sun sets at 8:02 p.m. silhouetting a crane just west of downtown Houston during a rare solar eclipse known as the "ring of fire" Sunday, May 20, 2012, in Houston. Johnny Hanson/Houston Chronicle/AP
Nick Bremner, Aaron Bremner, and Joel Bremner, from Sonoma, Calif., take a look at the solar eclipse through homemade masks made out of welding glass in Upper Bidwell Park at the Kiwanis Chico Community Observatory Sunday May 20, 2012 in Chico, Calif. Ty Barbour/Chico Enterprise Record/AP
An annular solar eclipse is seen over the sky during a wedding ceremony in Ibusuki, Kagoshima prefecture, southern Japan Monday, May 21, 2012. AP
Solar eclipse party: Even a partial eclipse was enough to draw thousands to Folsom Field in Colorado to see the moon take a bite from the sun.
ByStephanie Pappas, Space.com
Casey A. Cass/University of Colorado
Thousands of people turned their eyes to the sky at the University of Colorado's Folsom Field football stadium here Sunday (May 20) to watch the moon slip in front of the sun to create a spectacular "crescent sun."