NASA sharpens Roman telescope optics to a 63-nanometre error

NASA reported on 14 October that engineers had fine-tuned the Nancy Grace Roman Space Telescope. They checked the Wide Field Instrument’s 18 detectors and calibration system, then adjusted the optics. The instrument now has a root-mean-square optical error of 63 nanometres against a requirement of about 90 nanometres.

Why a tiny movement matters

Light from distant objects passes through several mirrors. Small misalignments blur the result. NASA says the team moved the secondary mirror by about one-sixteenth of a human hair’s diameter. This is an engineering milestone, not a new astronomical discovery, but it will shape the quality of future observations.

The next test

The agency estimates the wide-field image quality is nearly 30% better than predicted. Science on dark energy, galaxies and exoplanets still depends on sustained observations and analysis. For now, a key instrument has passed an important preparation step.

Official source.

Cover image source: NASA; official Roman telescope illustration.