After decades of predictions, astronomers say they’ve found evidence that the Milky Way’s central black hole, Sagittarius A*, pushes matter away in an effect likened to a “black hole wind.” The claim rests on five years of observations from ALMA, paired with o
For years. one idea sat in astrophysics like a prediction waiting for proof: that Sagittarius A*—the supermassive black hole at the Milky Way’s center—should radiate energy and. through that radiation. push nearby gas outward. It was predicted as far back as 1971. Yet until now, no one could point to evidence of that wind in a way astronomers could confidently verify.
Now, that gap appears to be closing.
Using five years of observations made with the Atacama Large Millimeter/Submillimeter Array (ALMA). researchers identified evidence of an outflow connected to Sagittarius A*. The observations were also correlated with other data. leading to the identification of a Southern Lobe of movement. along with evidence for a Northern Lobe.
The finding matters because it’s not just about spotting activity near a black hole. It’s about confirming a specific mechanism: the way energy emitted by a black hole can exert pressure on nearby matter—producing something akin to a solar wind, but powered from the depths of a galaxy.
The physics is tricky precisely because Sagittarius A* is unusually “quiet.” In more dramatic environments. black holes can be fed heavily. and the result is often massive amounts of matter being hurled outward. Sagittarius A* doesn’t behave that way. Instead. it’s described here as a very quiet SMBH. meaning the outflow would come from occasional small wisps of gas. Only a fraction of that gas gets turned into radiation. and that radiation is what then exerts pressure on the remaining gas.
That quiescent nature is one reason the evidence has been hard to pin down. Another reason is a matter of what would happen if the black hole were different. The text notes that having a well-fed SMBH—one whose event horizon rapidly expands—would be fascinating for astrophysics. For any nearby inhabited planets, though, the comparison is less comforting.
With the ALMA-based lobe evidence now in view. astronomers have at least a clearer target to chase: the kind of outward motion consistent with a black hole wind driven by radiation pressure from Sagittarius A*. The prediction from 1971 is no longer just theory—it has observational weight behind it. shaped by the slow. subtle behavior of a black hole that rarely announces itself.
Sagittarius A* Sgr A* ALMA black hole wind radiation pressure supermassive black hole Milky Way accretion astrophysics
So the black hole is windy now? lol
I don’t even know what ALMA is but if they found it after 5 years then cool. Black hole wind sounds like something in a sci fi movie though.
Wait, are they saying it’s pushing gas away like… from us? because if Sagittarius A* is in the middle of the galaxy and it’s quiet then what are we worried about? Seems like they’re just measuring lobe movement and calling it a wind?
I read this like 3 times and I’m still confused. “Northern lobe” “Southern lobe” ok but is that like weather patterns or something? Also the article says it’s driven by radiation pressure from a quiet black hole which sounds backwards, like I thought black holes only suck. If it’s been predicted since 1971 how come no one saw it until now? either way I guess space is wilder than my back yard.