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ASTROPHYSICS
Corona of the sun

Eclipsed!

UO scientists are among the millions anticipating this summer's low-light highlight August 21

Everyone is an astronomer, believes UO astrophysicist Scott Fisher 

“It’s embedded in our minds in a deep way. We go out and look up at the sky.”

With millions upon millions of people planning to do exactly that during this summer’s solar eclipse, Fisher might be onto something. 

eclipse protective glasses

Roughly one million of these aspiring astronomers will do their sun-gazing in Oregon, parts of which are situated in the eclipse’s path of totality where the moon will appear to completely cover the sun. The eclipse will travel across the entire continent, but its first landfall is in Oregon, where it can be seen from a band that stretches about 60 miles wide and includes Corvallis, Prineville, and Baker City. Eugene and Portland are both several miles outside its boundaries. 

Fisher’s best advice for the eclipse: “Just watch it.” 

And listen to it and feel it. According to Fisher, the solar eclipse will be a full sensory experience as day becomes night for just over two minutes. Nocturnal creatures will sound off, stars and planets will shine bright, and the temperature will plummet several degrees as the moon becomes the sky’s starring act. 

“It’s a life experience that you have to witness to understand why people are so hooked,” he says.

Fisher will be experiencing the sights and sounds of the eclipse from the small town of Madras in central Oregon. The drive from Eugene is normally about three hours, but Fisher will give himself close to two days to reach his viewing spot, and urges anyone interested in catching some sun to do the same. With 100 million people living within an eight-hour drive of the eclipse’s path through Oregon, he suspects Interstate 5, along with the roads through the Cascades, could turn into more of a parking lot than a highway. 

UO physics undergraduate student Charity Woodrum will be joining Fisher in Madras. She recommends doing whatever it takes to watch the eclipse from within totality, because the viewing experience will be drastically diminished, even at 99 percent of totality. 

“Even one percent of the sun is really bright,” she says. 

Woodrum says that there are eclipse “hounds” that find totality so appealing, they will go to great lengths to view rare solar events. Some fans will travel around the world to catch them. Eclipses actually average 2.4 per year, but with 80 percent of the Earth covered by water, many never pass above land. Especially fanatical groups have even chartered a plane to fly alongside the path of totality to extend their viewing time. 

Fortunately, most Ducks will not need to fly anywhere to get to the path of totality. The greatest challenge they will face will be battling crowds and finding somewhere to sleep—which may be harder than it sounds, since most lodging options in the state were booked months ago. 

UO particle physicist Jim Brau will be immersed in the sold-out crowds, delivering a speech on solar science at the OMSI Solar Eclipse Viewing Party in Salem, which is the first of five state capitals that the total eclipse will visit on August 21. 

Brau finds the sheer coincidence of the solar eclipse one of its most fascinating features.

“The moon only exists because the Earth collided with something the size of Mars 4.5 billion years ago, and that collision created matter that coalesced into the moon,” Brau explains. 

“That random collision created a moon that just so happens to be 400 times smaller than the sun and is now 400 times closer to the Earth. This exact ratio is the only reason the moon is able to block the sun in its entirety.”

Brau says the phenomenon of the solar eclipse won’t last forever because the moon is actually spiraling away from earth and that will eventually alter the necessary ratio for size and distance. Luckily, it’s moving in small steps, not giant leaps, and the 1.5 inches it travels each year will have little impact on eclipses for at least the next million years. But people looking to soak up an eclipse one billion years from now will be out of luck. 

While the distant future of solar eclipses is a bit bleak, they enjoy a rich history. 

“People actually used a solar eclipse to prove one of Einstein’s theories, the curving of spacetime,” says Fisher.

The credibility of Einstein’s theory of relativity was increased during a solar eclipse in 1919. Scientists tested the impact of the sun’s gravity on light by measuring the position of clusters of stars both before and during the eclipse. 

“The gravity of the sun changed the apparent position of the stars, which were visible thanks to the darkness during the eclipse,” he explains. “By measuring the difference in two pictures, they saw that Einstein was right about spacetime.”

The year before that monumental eclipse, the United States was focused on an eclipse set to cross over Oregon in June. Congress appropriated a hefty sum of money to the Naval Observatory to observe the total eclipse from Baker City, but might not have given enough consideration to the unpredictable weather in the Pacific Northwest. 

“It turned out to be a little bit of a disappointment. The clouds came in and obscured the sun,” says Brau. 

 

ECLIPSES AND OTHER WORLDS

Centuries ago, eclipses contributed to a conversation about the existence of extraterrestrial life. Dutch scientist Christiaan Huygens believed extraterrestrial life on Jupiter and Saturn must enjoy daily eclipses of their moons, due to orbit patterns. In the 17th century, he argued that astronomy on Earth likely began as an attempt to explain and predict eclipses, which meant civilizations on Jupiter and Saturn must be very sophisticated at astronomy, given the high frequency of eclipses. 

“Such texts spinning out wild theories about extraterrestrial customs on the basis of our few shared experiences, such as eclipses, were not necessarily an attempt to write an extraterrestrial anthropology,” UO historian Vera Keller explains. “They were an effort to decenter Earth’s perspective and to open everything believed about the cosmos up to question.”

These days, there is less revolutionary science and conjecture taking place during the eclipse, because astronomers have a solid understanding of planetary orbits and the solar eclipse itself. Scientists have been able to accurately predict these solar events since the 1800s. 

 

DARK SKIES, BRIGHT STARS

But for newcomers to sky-gazing, the eclipse is just one element of astronomy and related science, especially for those located in Oregon. The state is one of the last bastions of dark skies in the country and offers both aspiring and professional astronomers some of the best terrain to view the night sky all summer long.

Fisher urges everyone to take advantage of the UO’s Pine Mountain Observatory in central Oregon, which has little light pollution and one of the biggest telescopes in the Pacific Northwest. The facility is open to the public Friday and Saturday nights through Labor Day and is staffed by UO physics students who also conduct research at the observatory.

Charity Woodrum will be one of the students returning to Pine Mountain Observatory this year after taking a break last summer to complete an internship with NASA. Woodrum specializes in galaxy formation and evolution, but is well-versed in anything the public might spot from Pine Mountain Observatory, including Jupiter and Saturn, dying stars, galaxies that are 50 million miles away, and the Milky Way. She’s thrilled the eclipse will help other people discover this fascinating science and embrace their inner astronomer.

“It’s inherent in humans to look up and wonder,” she says. “It’s exciting that so many people will celebrate astronomy this summer.”

FIVE ECLIPSE FACTS

The eclipse on August 21 will travel west to east across the United States and pass over Oregon, Idaho, Montana, Wyoming, Nebraska, Kansas, Iowa, Missouri, Illinois, Kentucky, Tennessee, North Carolina, Georgia, and South Carolina.

A beach north of Newport, Oregon, will be the first land the eclipse will hit at 10:15 a.m.

The speed of the moon as it moves across the sun is approximately 1,398 miles per hour. It will spend only 10 minutes in the state of Oregon. 

A total solar eclipse is the only time it is safe to look directly at the sun without protection. Special solar glasses must be covering eyes during partial phases of the eclipse. 

A total solar eclipse is also the only time the naked eye can see the sun’s corona stretching into space. The corona is the sun’s outer atmosphere that is actually very bright, but is normally not visible because the sun is even brighter. 

ECLIPSE TALKS BY UO SCIENTISTS

August 1, 6:00 p.m.
Scott Fisher, "Path of Totality"

Portland Science Night
Widmer Brothers Brewing
Portland, OR

August 9, 6:00 p.m.
Scott Fisher, Falling Sky Pizzeria,
Erb Memorial Union

August 16, 6:00 p.m.
Jim Brau, “Total Solar Eclipse of 2017”

Eugene Public Library

August 21, 8:00 a.m.
Jim Brau, “Solar Science" OMSI Solar Eclipse Viewing Party,
L. B. Day Amphitheater,
Oregon State Fair and Expo Center, Salem (Sold out)

Emiliy Halnon is a staff writer for UO Communications.

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