Boyertown Area High School astronomy teacher Peter Detterline prepares high powered binoculars with a solar filter so that his students may view the planet Mercury as it transits across the face of the sun , Monday, May 9, 2016, Boyertown Area High School, Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

Boyertown Area High School 12th grade student Ben Maurer uses his smartphone and a photographers lens with a solar filter to make a photograph of the planet Mercury transitting the sun, Monday, May 9, 2016, Boyertown area High School, Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

Boyertown Area High School 12th grade student Jay Hallman looks through a photographers lens and solar filter to see the planet Mercury as it transits across the face of the sun , Monday, May 9, 2016, Boyertown area High School, Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

Boyertown Area High School students, 12th grader Bransen Mackey, left, and 11th grader Nick Cioppi wear solar safety glasses and attempt to see the planet Mercury as it transits across the face of the sun, Monday, May 9, 2016, Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

The planet Mercury is seen in silhouette, lower left, as it transits across the face of the sun Monday, May 9, 2016, as viewed from Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

The planet Mercury is seen in silhouette, lower third of image, as it transits across the face of the sun Monday, May 9, 2016, as viewed from Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

The planet Mercury is seen in silhouette, lower left of image, as it transits across the face of the sun, Monday, May 9, 2016, as viewed from Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

The planet Mercury is seen in silhouette, lower center of image, as it transits across the face of the sun, Monday, May 9, 2016, as viewed from Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)

The planet Mercury is seen in silhouette, lower left of image, as it transits across the face of the sun, Monday, May 9, 2016, as viewed from Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. Photo Credit: (NASA/Bill Ingalls)