WASHINGTON - The sun is about to spill some of its secrets and maybe reveal a few hidden truths. And you can get in on the action next week if you are in the right place for the best solar eclipse in the U.S. in nearly a century.
Astronomers are going full blast to pry more science from the mysterious ball of gas. They'll look from the ground. They'll look from the International Space Station and a fleet of 11 satellites in space. And in between, they'll fly three planes and launch more than 70 high- altitude balloons.
"We expect a boatload of science from this one," said Jay Pasachoff, a Williams College astronomer who has traveled to 65 eclipses of all kinds.
Scientists will focus on the sun, but they will also examine what happens to the Earth's weather, to space weather and to animals and plants on Earth as the moon blocks out the sun. The moon's shadow will sweep along a path, from Oregon to South Carolina.
Between NASA and the National Science Foundation, the federal government is spending about $7.7 million on next Monday's eclipse.
One of the NASA projects has students launching high-altitude balloons to provide "live footage from the edge of space" during the eclipse.
But it's not just the professionals or students. NASA has a list of various experiments everyday people can do.
"Millions of people can walk out on their porch in their slippers and collect world-class data," said Matt Penn, an astronomer at the National Solar Observatory in Tucson, Ariz.
Penn is chief scientist for a National Science Foundation-funded movie project nicknamed Citizen CATE. More than 200 volunteers have been trained and given special telescopes and tripods to observe the sun at 68 locations in the exact same way. The thousands of images from the citizen scientists will be combined to produce a movie of the usually hard-to-see sun's edge.
Mike Conley, a Salem, Ore., stock trader whose backyard is studded with telescopes, jumped at the chance to be part of the science team.
"Who knows? Maybe a great secret will come of this, the mysteries of the sun will be revealed, because we're doing something that's never been done before and we're getting data that's never been seen before," he said. "A big discovery will come and everybody will say, 'Hey, we were part of that!'"
You don't need to have telescopes to help out. You can use the iNaturalist app via the California Academy of Sciences and note the reaction of animals and plants around you. You can go to a zoo, such as the Nashville Zoo, where they are asking people to keep track of what the animals are doing. The University of CaliforniabBerkeley, is seeking photos and video for its Eclipse Megamovie 2017, hoping to get more than 1,000 volunteers.
Even with all the high-tech, high-flying instruments available, when it comes to understanding many of the sun's mysteries, nothing beats an eclipse, said Williams College's Pasachoff. That's because the sun is so bright even satellites and special probes can't gaze straight at it just to glimpse the outer crown, or corona. Satellites create artificial eclipses to blot out the sun, but they can't do it as well as the moon, he said.
The corona is what astronomers really focus on during an eclipse. It's the sun's outer atmosphere where space weather originates, where jutting loops of red glowing plasma lash out and where the magnetic field shows fluctuations. The temperature in the outer atmosphere is more than 1 million degrees hotter than it is on the surface of the sun, and scientists want to figure out why.
"It's ironic that we've learned most about the sun when its disk is hidden from view," said Fred "Mr. Eclipse " Espenak, a retired NASA astronomer who specialized in eclipses for the space agency.
And they learn other things, too. Helium - the second most abundant element in the universe - wasn't discovered on Earth until its chemical spectrum was spotted during an eclipse in 1868, Espenak said.
But that discovery is eclipsed by what an eclipse did for Albert Einstein and physics.
Einstein was a little-known scientist in 1915 when he proposed his general theory of relativity, a milestone in physics that said what we perceive as the force of gravity is actually from the curvature of space and time. It explains the motion of planets, black holes and the bending of light from distant galaxies.
Einstein couldn't prove it but said one way to do so was to show that light from a distant star bends during an eclipse. During a 1919 eclipse, Arthur Eddington observed the right amount of bending, something that couldn't be done without the moon's shadow eclipsing the sun.
"It marked a complete change in the understanding of the universe," said Mark Littmann of the University of Tennessee, a former planetarium director. "Bang. Right there."
Total Solar Eclipse coverage
- Meet a solar eclipse baby born during totality in Chattanooga [video, photos]
- Thrillseekers take to Ocoee River for solar eclipse viewing
- Thousands of solar eclipse tourists flood Spring City, Tenn.
- Athens locals and tourists have 'lifetime experience' viewing eclipse
- Several babies born in Chattanooga during solar eclipse
- Greeson: Will Great American Eclipse lead to next great American moment?
- VIDEO: Time-lapse of sky darkening at Tennessee Aquarium during solar eclipse
- Wiedmer: Could watching the eclipse really cost Bama a national title?
- Solar eclipse lights up Chattanooga Bakery-made MoonPie sales
- VIDEO: NASA streaming the eclipse as it begins in Oregon
- Crowds gather for eclipse in Athens
- Traffic at a standstill on US-27 heading into Dayton [video]
- Chattanooga Bakery offers year's supply of Moonpies for best photo or tweet today
- Thousands to converge on Spring City, bracing for eclipse [photos]
- Eclipse watchers flocking to Tennessee sites
- Americans stake out prime viewing spots to see sun go dark
- Wiedmer: Eclipse an especially big deal in Hopkinsville, Ky.
- Off the Couch: Glasses on and ready for total solar eclipse
- Why is the eclipse longer in some places than in others?
- Solar eclipse viewers expected to put pressure on road systems
- How to stay healthy during the solar eclipse
- Clear skies expected for total solar eclipse
- The best way to see an eclipse is in the biggest crowd
- An eclipse chaser's guide to your first eclipse
- Experts offer advice for taking eclipse photos with your smartphone
- Eclipse times for Southeast Tennessee cities
- Eclipse gatherings around the region
- Easily-made 'pinhole projector' always an option to view solar eclipse
- Special eclipse glasses selling out quickly
- Here are 30 stellar locations for making memories during Monday's solar eclipse
- Bonnie Tyler to sing 'Total Eclipse' hit during eclipse
- More than spectacle: Eclipses create science and so can you
- Southeast Tennessee guide to the total solar eclipse [photos]
- Total Solar Eclipse expected to draw thousands to Tennessee
- 5 questions answered about the solar eclipse
- Celestial celebrations: Party planners getting ready for eclipse [photos]
- Hamilton County schools to close for total solar eclipse
- Here are 22 places in East Tennessee to watch the solar eclipse
- U.S. in rare bull's-eye for total solar eclipse on Aug. 21
- What's a total solar eclipse and why this one is so unusual
- Total solar eclipse 1st in 99 years to sweep width of US
- Solar eclipse mania spurs festivals, tours, sold-out hotels