For thousands of years, humanity viewed the skies as unchanging, except for a few wandering stars (that we now know are planets). As we improved our ability to perceive the cosmos with light-gathering telescopes and electronic detectors, we realized that the universe is full of things that change in brightness, whether it be an exploding star or a matter-gulping black hole. NASAs Nancy Grace Roman Space Telescope is poised to deliver an avalanche of such transients, including thousands of standard candle supernovae that allow us to measure the expansion history of the universe.
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