You can expect a slew of exciting discoveries from the new telescope because it was built to look across the universe and study the three-dimensional distribution of dark matter. While scientists haven't directly observed it before, dark matter produces unseen effects on objects in the universe, similar to those produced by visible matter.
Likewise, Roman will see exploding stars called supernovas that allow astronomers to measure how fast the universe has been expanding. Those measurements will help astronomers measure the varying expansion rate of the universe. Dark matter and dark energy, also not yet directly observed, together are the source of the vast majority of energy in the universe, but their physical natures are unknown...
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