When the sun goes dark: 5 questions answered about the solar eclipse

By Shannon Schmoll, Director, Abrams Planetarium, Department of Physics and Astronomy, Michigan State University. NASA's projection of the August 21 solar eclipse. NASA Editor’s note: A total solar eclipse will be visible across the U.S. on Monday, August 21. Shannon Schmoll, director of the Abrams Planetarium at Michigan State University, explains why and how it happens,…