Summary:

- NASA's Nancy Grace Roman Space Telescope is being prepared to study dark energy by observing exploding stars called supernovae. Supernovae can be used as "standard candles" to measure the expansion of the universe and help understand the mysterious dark energy that drives this expansion.

- The Roman Space Telescope's wide field of view and high-resolution imaging capabilities will allow it to detect and study thousands of supernovae over its planned 5-year mission, providing unprecedented data to improve our understanding of dark energy.

- By precisely measuring the brightness and redshift of distant supernovae, the Roman mission will build on the work of previous telescopes like Hubble and help answer fundamental questions about the nature of dark energy and the fate of the universe.