NASA engineers at the Goddard Space Flight Center have completed the final inspection of the primary mirror for the Nancy Grace Roman Space Telescope, a major step ahead of its shipment to the launch site. The 7.9-foot (2.4-meter) mirror will play a crucial role in collecting and focusing light from cosmic objects, enabling the telescope to capture detailed wide-field images of the universe.
What happened
On May 20, the engineering team tilted the Roman telescope onto its side and deployed a protective “hood” designed to shield the mirror during launch preparations. Using a specialized high-resolution camera with a powerful zoom lens, engineers conducted a detailed visual inspection of the mirror’s surface, confirming it was free from contamination or coating defects. They also verified that the optical elements remained properly aligned following a recent observatory shake test. The mirror passed all tests successfully, keeping the project on schedule for an early September launch.
The primary mirror features a silver coating less than 400 nanometers thick, optimized for reflecting near-infrared light. This differs from other space telescopes like Hubble, which uses aluminum and magnesium fluoride for visible and ultraviolet light, and James Webb, whose mirrors are gold-coated for longer infrared wavelengths. The mirror’s surface irregularities are exceptionally small—averaging only 1.2 nanometers in height—more than twice as smooth as mission requirements. Made from ultralow-expansion glass, the mirror resists shape changes due to temperature fluctuations in space, preserving image quality.
Why it matters
The primary mirror’s precision and coating enable the Roman Space Telescope to conduct highly sensitive astronomical observations, particularly in near-infrared wavelengths. This allows the mission to explore cosmic phenomena such as dark energy, exoplanets, and galaxy formation with unprecedented clarity. The successful inspection marks a key milestone towards launch, ensuring nothing compromises the telescope’s optical performance once in space.
Background
The Nancy Grace Roman Space Telescope, managed by NASA’s Goddard Space Flight Center, is designed to survey large portions of the sky to answer fundamental questions about the universe. It involves collaboration with NASA’s Jet Propulsion Laboratory, Caltech/IPAC, the Space Telescope Science Institute, and other research institutions. The mission aims to complement other observatories like Hubble and James Webb by providing wide-field infrared observations starting shortly after its planned launch in 2024.
Sources
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