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During the solar eclipse of May 1919 gravitational lensing around the Sun (about 1000 Jupiter masses) was observed for the first time. But whether the lensing is visible depends not only on mass of the body in question, but also on density and surface gravity. Since red and brown dwarfs are much denser than the Sun they also have a higher surface gravity ...


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Gaia is the follow-up to the Hipparcos mission, which was deactivated in 1993. So Gaia's results are decades in the making. The word "Gaia" was originally an acronym for "Global Astrometric Interferometer for Astrophysics" but as the scope of the science goals of the mission grew greatly, this became antiquated and is now obsolete. The ...


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