Habitable Worlds Observatory will need precision astrometry to weigh Earth‑like exoplanets, paper argues
The Habitable Worlds Observatory (HWO) is aimed at directly imaging Earth‑like exoplanets and obtaining atmospheric spectra, but a new arXiv preprint by Kaz Gary et al. says images and spectra alone won't suffice. HWO will require precision astrometry to measure planet masses—essential to interpreting biosignature signals.