The Nancy Grace Roman Space Telescope will feature an active coronagraph with deformable mirrors to suppress starlight, enabling the direct imaging of Jupiter-like exoplanets.

NASA's upcoming Nancy Grace Roman Space Telescope will employ the first space-bound active coronagraph to suppress starlight and reveal faint exoplanets. Launching as early as next month, the telescope uses two deformable mirrors to cancel out glare, improving sensitivity by up to 1,000 times compared to existing instruments. This technology aims to capture reflected light from mature gas giants, marking a significant step toward future missions capable of imaging Earth-like worlds.

Active Wavefront Control Technology

The telescope's coronagraph utilizes two deformable mirrors, each equipped with a 48-by-48 grid of actuators. These tiny pistons can adjust the mirror surface in increments as small as 10 picometers, roughly a tenth the diameter of a hydrogen atom. By measuring and suppressing leftover light before each observation, the system creates a dark region around a star, functioning similarly to noise-canceling headphones for light.

Targeting Jupiter-like Worlds

Current space telescopes primarily image young, hot, oversized exoplanets that emit their own heat. The Roman telescope is designed to detect mature, cool gas giants that reflect light from their host stars. While these planets will likely appear as only a few pixels, the instrument will allow astronomers to analyze their light across different wavelengths to determine atmospheric chemistry.

Scientific Goals and Future Missions

Beyond exoplanet imaging, the telescope carries a 300-megapixel wide-field camera to study dark matter and dark energy, with the capacity to detect approximately 100,000 new exoplanets. The data gathered by the coronagraph will serve as a technical foundation for NASA's proposed Habitable Worlds Observatory, which aims to eventually image Earth-like planets orbiting sunlike stars.