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NASA opens the Flight Dynamics Research Facility at Langley, its first major new wind tunnel in more than 40 yearsDLR's Institute of Solar Research wins two EU-SOLARIS awards for its work on concentrated solar power researchCanadian Space Agency astronaut Joshua Kutryk prepares for his first spaceflight as part of NASA's SpaceX Crew-13 missionAstronomers using ESO's Very Large Telescope capture the clearest image yet of Betelgeuse's long suspected companion starThe Department of Energy invests in Fermilab projects that use AI to accelerate scientific discovery under the Genesis MissionStarship 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's Hayabusa2 spacecraft completes its closest ever flyby of a solar system body during an encounter with asteroid TorifuneESA's Euclid space telescope discovers 31 of the most ancient quasars ever found, including the earliest yet observedLIGO, Virgo, and KAGRA update their gravitational wave catalog with evidence for second generation black holesSKA Observatory welcomes France as its fourteenth member state as new Director General Jessica Dempsey takes chargeVirgin Galactic prepares its Delta class spaceship for a first research spaceflight expected this summerCERN shuts down the Large Hadron Collider for a major upgrade to the High Luminosity LHC due back online in 2030The Vera Rubin Observatory already logs over 11,000 new asteroids in the opening days of its ten year Legacy Survey
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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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