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NASA's Swift Observatory prepares for a robotic boost as the LINK spacecraft readies to raise its orbitDLR's SOLIS100 isolation study concludes after 100 days, as six crew members leave their simulated space habitat in CologneThe Canadian Space Agency launches five weather balloons from Ontario for its STRATOS 2026 stratospheric research campaignESO's Very Large Telescope captures the clearest image yet of Betelgeuse B, the long sought companion starFermilab's Muon g-2 experiment achieves its most sensitive search yet for the muon's electric dipole momentStarship completes its thirteenth flight test and deploys twenty Starlink satellites, the first operational payload the vehicle has ever releasedNASA agrees to let Blue Origin hot fire New Glenn second stages on the historic B-2 stand at Stennis Space CenterALMA finds warm organic rich stellar cocoons surviving inside the wreckage of a supernova remnantJAXA successfully launches its H3 rocket carrying the QZS-7 Michibiki satellite into orbit from TanegashimaESA broadcasts live coverage of the total solar eclipse over Spain, the first seen there since 1905LIGO, Virgo, and KAGRA update their gravitational wave catalog with evidence for second generation black holesThe SKA Observatory releases a new anthology documenting the vast range of astronomy its telescopes will enableVirgin Galactic and Operation Period announce OP-01, the first spaceflight dedicated to studying menstruation in microgravityThe first major structure of CMS's future tracker arrives at CERN ahead of the High Luminosity LHC upgradeThe Vera Rubin Observatory releases a deep new image of the COSMOS field, showing hundreds of thousands of distant galaxies
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How Many Black Holes Are in the Milky Way?

How Many Black Holes Are in the Milky Way?

How many black holes are in the Milky Way? Likely 100 million to a billion, plus Sagittarius A* at the center. Here is how astronomers count what they cannot see.

July 30, 202613 min read
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