Cutting-edge heat shield installed on Parker Solar Probe: NASA

In this file photo taken on March 28, 2018, engineers examine the Parker Solar Probe during a media preview at NASA Goddard Space Flight Center in Greenbelt, Maryland. The Parker Solar Probe will launch on a United Launch Alliance Delta IV Heavy rocket from Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida no earlier than August 4, 2018. The mission will perform the closest-ever observations of a star when it travels through the Sun's atmosphere, called the corona.[File Photo: AFP/JIM WATSON]