The case for an astrometric mission extension of Euclid: Extending Gaia by six magnitudes with Euclid covering one third of the sky 

https://arxiv.org/abs/2510.23694
https://ui.adsabs.harvard.edu/abs/2025A%26A...704A.193B/abstract
https://www.aanda.org/articles/aa/full_html/2025/12/aa57407-25/aa57407-25.html