Astronomical observations reveal a major deficiency in our understanding of physics—the
detectable mass is insufficient to explain the observed motions in a huge variety of systems …

This report summarises progress made in estimating the local density of dark matter (ρ
DM,⊙), a quantity that is especially important for dark matter direct detection experiments …

Context. Gaia Early Data Release 3 (Gaia EDR3) contains results for 1.812 billion sources in
the magnitude range G= 3–21 based on observations collected by the European Space …

Context. Gaia Early Data Release 3 (Gaia EDR3) gives trigonometric parallaxes for nearly
1.5 billion sources. Inspection of the EDR3 data for sources identified as quasars reveals …

We present a cross-calibration of Hipparcos and Gaia EDR3 intended to identify
astrometrically accelerating stars and to fit orbits to stars with faint, massive companions …

We test Milgromian dynamics (MOND) using wide binary stars (WBs) with separations of 2–
30 kAU. Locally, the WB orbital velocity in MOND should exceed the Newtonian prediction …

Context. Gaia-CRF3 is the celestial reference frame for positions and proper motions in the
third release of data from the Gaia mission, Gaia DR3 (and for the early third release, Gaia …

Context. We present the early installment of the third Gaia data release, Gaia EDR3,
consisting of astrometry and photometry for 1.8 billion sources brighter than magnitude 21 …

Aims. We aim to demonstrate the scientific potential of the Gaia Early Data Release 3
(EDR3) for the study of different aspects of the Milky Way structure and evolution and we …

The Gaia Galactic survey mission is designed and optimized to obtain astrometry,
photometry, and spectroscopy of nearly two billion stars in our Galaxy. Yet as an all-sky multi …