A heavy fog rolls in as the United Launch Alliance (ULA) Atlas-V rocket with NASA's InSight spacecraft onboard awaits launch, Friday, May 4, 2018, at Vandenberg Air Force Base in California. InSight, short for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, is a Mars lander designed to study the "inner space" of Mars: its crust, mantle, and core. Photo Credit: (NASA/Bill Ingalls)