NASA's $1.5 billion Parker Solar Probe launched Aug. 12, 2018, atop a ULA Delta IV Heavy rocket from then-Cape Canaveral Air Force Station.

NASA's $1.5 billion Parker Solar Probe launched Aug. 12, 2018, atop a ULA Delta IV Heavy rocket from then-Cape Canaveral Air Force Station.

For scientists, the eclipse is a rare opportunity to study the sun — particularly its outer atmosphere, or the corona. Here's what NASA and others have planned.

For scientists, the eclipse is a rare opportunity to study the sun — particularly its outer atmosphere, or the corona. Here's what NASA and others have planned.