In late August, a telescope bearing the name of NASA's first female executive will lift off from Kennedy Space Center and turn its gaze toward the ninety-five percent of the universe that remains invisible to us. The Nancy Grace Roman space telescope — born from a repurposed spy satellite and completed ahead of schedule — arrives at a moment when cosmology stands at the edge of a possible revolution, with recent data hinting that dark energy, long assumed to be fixed, may in fact be changing. What Roman seeks is not merely data, but a reckoning with the deepest questions science has yet to ans