NASA is preparing to launch one of its most ambitious space observatories yet, a telescope designed to tackle some of astronomy’s biggest unanswered questions while surveying the universe on an extraordinary scale. NASA and SpaceX are targeting August 30 for the launch of the Nancy Grace Roman Space Telescope aboard a Falcon Heavy rocket from Kennedy Space Center in Florida. Once in space, Roman will travel to the second Sun-Earth Lagrange point, or L2, roughly one million miles from Earth — the same general region used by the James Webb Space Telescope. Roman’s mission is unusually broad. …