Great American Eclipse
A crowd wears protective glasses as they watch the beginning of the solar eclipse from Salem, Oregon, Monday, August 21, 2017.
This is the first total solar eclipse visible in the U.S. since 1979 and the first in 99 years to cross the entire country. The "path of totality" stretches from Oregon to South Carolina, with other parts of the country seeing a partial eclipse.
Solar eclipse begins
The first moments of the solar eclipse over Depoe Bay, Oregon, August 21, 2017.
Solar eclipse progresses
The solar eclipse progresses over Depoe Bay, Oregon, August 21, 2017.
Solar eclipse totality
The eclipse reaches totality in this image from NASA TV over Madras, Oregon, August 21, 2017.
Madras, Oregon
Darkness briefly descends during the total solar eclipse, as seen from the Lowell Observatory Solar Eclipse Experience in Madras, Oregon, August 21, 2017.
Eclipse "diamond ring effect"
The "diamond ring effect" -- when a bead of sunlight peeks past the edge of the moon -- is seen from the Lowell Observatory Solar Eclipse Experience on August 21, 2017 in Madras, Oregon.
Depoe Bay, Oregon
A boy uses solar viewing glasses in Depoe Bay, Oregon, August 21, 2017.
Madras, Oregon
The total solar eclipse Monday, August 21, 2017 in Madras, Oregon.
Redmond, Oregon
The moon almost entirely covers the sun during the solar eclipse Monday, August 21, 2017, near Redmond, Oregon.
Casper, Wyoming
People set up cameras and telescopes as they prepare to watch the total eclipse at South Mike Sedar Park in Casper, Wyoming, August 21, 2017.
Grand Teton National Park
The sun in full eclipse over Grand Teton National Park on August 21, 2017 outside Jackson, Wyoming.
Carbondale, Illionis
Cheerleaders use solar viewing glasses before welcoming guests to the football stadium to watch the total solar eclipse at Southern Illinois University in Carbondale, August 21, 2017. Carbondale lies right in the path of totality, with the moon blocking out the sun for a maximum duration of about two minutes and 40 seconds.
Space Station crosses eclipsed sun
This composite image, made from seven frames, shows the International Space Station, with a crew of six onboard, as it transits the sun at roughly five miles per second during a partial solar eclipse, Monday, August 21, 2017 near Banner, Wyoming.
Metropolis, Illinois
A 15-foot-tall statue of Superman wears solar eclipse glasses in Metropolis, Illinois, a town located along the eclipse path of totality.
Guernsey, Wyoming
Cooper Jackson tries out his new solar glasses in a designated eclipse viewing area in a campground near Guernsey, Wyoming, August 20, 2017.
Venice, California
The partial solar eclipse as seen from Venice, California, on Monday, August 21, 2017.
Eclipse with dinosaur
The total solar eclipse is seen over a T. rex statue in Casper, Wyoming, on August 21, 2017.
Solar eclipse
This composite image of nine pictures from NASA shows the progression of the solar eclipse near Banner, Wyoming on Monday, Aug. 21, 2017.
Myrtle Beach, South Carolina
A man tries to capture the solar eclipse on his smartphone in Myrtle Beach, South Carolina, on August 21, 2017 in Myrtle Beach, South Carolina. Myrtle Beach was supposed to see 99-percent coverage of the sun by the moon but heavy cloud cover prevented people from seeing the moment of most coverage.
White House view
President Donald Trump and first lady Melania Trump wear protective glasses as they view the solar eclipse from the Truman balcony of the White House in Washington.
President Trump
President Donald Trump glanced up at the sun without eclipse glasses on for a fraction of a second.
Sun's corona
The sun's corona is visible as the moon passes in front of the sun during a total solar eclipse at Big Summit Prairie ranch in Oregon's Ochoco National Forest on August 21, 2017.
Eclipse seen from space
Six astronauts had a unique perspective on the solar eclipse from 250 miles above Earth on the International Space Station. European Space Agency (ESA) astronaut Paolo Nespoli captured this image of the Moon's shadow crossing America.
Hilton Head, South Carolina
Brothers Chris and Gabe Fabiano watch the solar eclipse on the beach on Hilton Head Island, South Carolina, on August 21, 2017.
Isle of Palms, South Carolina
Ezra Packham, of Jacksonville, Florida, looks through his solar glasses in preparation for the solar eclipse Monday, Aug. 21, 2017, on the beach at Isle of Palms, South Carolina.
Eclipse over Ross Lake, Washington
In this NASA composite image, the progression of a partial solar eclipse is seen over Ross Lake, in Northern Cascades National Park, Washington, August 21, 2017.
Pasadena, California
Asha Moore uses solar eclipse glasses and her iPhone to show a friend from Canada on the phone the view of the partial solar eclipse from Beckman Lawn at Caltech in Pasadena, California on August 21, 2017.
Texas Motor Speedway
Spectators watch the partial solar eclipse as it is broadcast on Big Hoss at Texas Motor Speedway on August 21, 2017 in Fort Worth, Texas.
Nashville
Sunlight peeking out at the edge of the eclipse causes a starburst effect over Nashville, Tennessee, on August 21, 2017. Nashville was the largest city to lie within the eclipse's path of totality.
Madras, Oregon
A total solar eclipse seen from the Lowell Observatory Solar Eclipse Experience on August 21, 2017 in Madras, Oregon. Emotional sky-gazers cheered and applauded as the sun briefly vanished behind the moon.
Garden City, New York
Children look skyward during a partial eclipse of the sun on August 21, 2017 at the Cradle of Aviation Museum in Garden City, New York.
New York City
A man views the solar eclipse from the "Top of the Rock" observatory at Rockefeller Center, August 21, 2017 in New York City. While New York City was not in the path of totality for the solar eclipse, around 72 percent of the sun was covered by the moon during the peak time of the partial eclipse.
New York
The partially eclipsed sun peeks through clouds over New York City, August 21, 2017.
Fort Worth, Texas
Two boys in NASA t-shirts watch the solar eclipse at Texas Motor Speedway on August 21, 2017 in Fort Worth, Texas.
Eclipse composite
A composite image of the total solar eclipse seen from the Lowell Observatory Solar Eclipse Experience August 21, 2017 in Madras, Oregon.
Depoe Bay, Oregon
People use solar viewing glasses in Depoe Bay, Oregon, August 21, 2017.
Pasadena, California
People use solar eclipse glasses to view the solar eclipse from Beckman Lawn at Caltech in Pasadena, California on August 21, 2017.
"Baily's Beads"
The "Baily's Beads" effect is seen during a total solar eclipse, as sunlight peeks through valleys on the moon's surface. This photo was taken from the Lowell Observatory Solar Eclipse Experience in Madras, Oregon, on August 21, 2017.
Des Moines, Iowa eclipse
Susan Boll, of Carlisle, Iowa, reacts as she puts her glasses on during an eclipse-watching party, August 21, 2017, in Des Moines, Iowa.
Mexico City
View of a partial solar eclipse as seen in Mexico City, on August 21, 2017. Astronomy buffs set up telescopes fitted with special sun filters in parks and squares in various cities.
Carbondale, Illinois
People watch the solar eclipse at Saluki Stadium on the campus of Southern Illinois University on August 21, 2017 in Carbondale, Illinois. With approximately 2 minutes 40 seconds of totality, the area in Southern Illinois experienced the longest duration of totality during the eclipse.
Madras, Oregon
Barbara Hintzen of Edmonds, Washington records the sun during the total solar eclipse on August 21, 2017 in Madras, Oregon.
Washington, D.C.
People watch the eclipse on the National Mall in Washington, D.C., on August 21, 2017. Known as the Great American Eclipse, it was the first eclipse in 99 years whose path of totality stretched across the U.S. from coast to coast.
Solar eclipse visitors
A visitor puts a pin on map to show where she is visiting from during the Wyoming Eclipse Festival in Casper, Wyoming. Thousands of people have descended on Casper to view the eclipse in the path of totality.
Chapel Hill, North Carolina
Animals (in this case, alpacas) joined people at the 1870 Farm in Chapel Hill, North Carolina, to enjoy the eclipse.
Madras, Oregon
Tens of thousands of people camped out in Madras, Oregon, for a front-row view of the total solar eclipse.
Solar eclipse traffic jam
RV traffic sits at a standstill along a two-lane road near Madras, Oregon, on August 17, 2017 as tens of thousands of visitors gathered for a prime view Monday's total solar eclipse.
St. Louis, Missouri
Jason Arbaugh, of Austin, lines up his shot for the solar eclipse at the Gateway Arch in St. Louis on Monday, August 21, 2017.
Wyoming telescope
Rick Roty works with his telescope in a designated eclipse viewing area in a campground near Guernsey, Wyoming, August 20, 2017.
Solar eclipse animation
NASA animation shows how the moon's shadow descends on Earth during a total solar eclipse.
Carbondale, Illinois
A worker passes out eclipse viewing glasses to guests at the football stadium, where thousands gathered to watch the total solar eclipse at Southern Illinois University in Carbondale, August 21, 2017.
Casper, Wyoming
Brian Marriott drove all the way from Boston to see the total solar eclipse at South Mike Sedar Park in Casper, Wyoming, on August 21, 2017.
Columbia, South Carolina
Children watch a presentation about the eclipse during a drive-in movie at the Historic Columbia Speedway August 20, 2017 in Columbia, South Carolina. Columbia is one of the prime destinations for viewing Monday's solar eclipse.
Carbondale, Illinois
Marching band members Ashton Websterand Haley Stellmach watch the solar eclipse at Saluki Stadium on the campus of Southern Illinois University on August 21, 2017 in Carbondale, Illinois.
Carbondale will also be in the path of the next U.S. solar eclipse on April 8, 2024.
Wyoming campgrounds
A minibus parked in a designated eclipse viewing area is seen in a campground near Guernsey, Wyoming, August 20, 2017.
Oregon Eclipse Festival
People pose for photos in an installation called Exsucitare Triectus by artist Orion Fredericks at the Oregon Eclipse Festival, August 20, 2017, at Big Summit Prairie ranch in Oregon's Ochoco National Forest, near the city of Mitchell, ahead of the total solar eclipse on August 21, 2017.
Salem, Oregon
Jonathan Moric, left, and Finn Power, both of Vancouver, get ready to watch the eclipse Monday, August 21, 2017, in a park in Salem, Oregon.
Eclipse merch
Melissa Howe displays one of her eclipse t-shirts designs in Guernsey, Wyoming.