Gaia could detect free-floating black holes passing near stars in the Milky Way

 Typically we can only detect their presence when we can detect their gravitational pull. 

 it would be fiendishly hard to detect them. But now we have a new potential data set to do so

Gaia just released its massive 3rd data set that contains astrometry data for over 1.5 billion stars,

 Luminous stars are Gaia's specialty, but many have "dark companions"

 The second focused on whether the data contains hints of very long binary orbital relationships with orbital periods

Gaia itself collects astrometry data, which detects the position, motions, and magnitudes of stars.

 about 300,000 stars in Gaia's catalog are exhibiting acceleration events.

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