NASA is preparing to launch the Nancy Grace Roman Space Telescope, a mission designed to advance the direct observation of exoplanets. Scheduled for launch as early as next month, the telescope will feature the first space-based “active” coronagraph, an instrument capable of suppressing starlight to reveal the faint light of orbiting planets.
While previous telescopes like Hubble and the James Webb Space Telescope have utilized stationary coronagraphs, the Roman telescope introduces active wavefront control. This system employs two deformable mirrors, each backed by a grid of actuators. These tiny pistons can adjust the mirror surface by increments as small as 10 picometers, effectively sculpting the light to cancel out glare. According to project systems engineer Ilya Poberezhskiy, this process creates a “doughnut-shaped region” of darkness around a star, improving sensitivity to exoplanets by up to 1,000 times compared to existing technology.
The telescope’s capabilities are expected to shift the field of exoplanet research from indirect inference to direct imaging. Astronomers anticipate the ability to study mature gas giants similar to Jupiter, which are currently difficult to distinguish from their host stars. By analyzing the wavelengths of light reflected from these planets, researchers hope to gain insights into their atmospheric chemistry.
Beyond exoplanet detection, the mission will utilize a 300-megapixel wide-field camera to investigate dark matter and dark energy, with the potential to identify approximately 100,000 new exoplanets. Experts view the mission as a vital technological precursor to future projects, such as the proposed Habitable Worlds Observatory, which aims to eventually image Earth-like planets.
Source: MIT Technology Review
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