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Bad Astronomy | Holmberg 15A likely has only one supermassive black hole in it, not two or three

Around 760 million light years from Earth lies the galaxy cluster Abell 85, a mighty collection of about 500 galaxies all orbiting one another. At its center is the enormous elliptical galaxy Holmberg 15A… and I do mean enormous; some estimates put it at well over 50 trillion times the mass of the Sun, dozens of times more massive than the Milky Way. All big galaxies have a supermassive black hole in their hearts, millions or billions of times the Sun s mass. In very rough terms the black hole size scales with the galaxy, and since the galaxy is so huge it s thought the black hole at its core may be as well. It s never been measured directly, but using various indirect bellwethers its mass has been estimated at tens of billions to well over a hundred billion times the Sun s mass. If true, it s the most massive black hole known. However, its actual size is in fact unknown.

Bad Astronomy | Mars spider-like dark features are due to eruptions of gas and dust

Dark sprays of material at the south pole of Mars are due to eruptions of CO2 and dust

Bad Astronomy | Will December 21, 2020 mark the end of the world? In a word, NO

last time the Earth wasn t destroyed. And here we are again. Of course, it s 2020, so maybe you re shrugging your shoulders and thinking, Oh, it s something about the end of the world? Yeah, add it to the pile. But we do have real issues to contend with right now perhaps you ve noticed and a lot of folks aren t familiar enough with astronomy to understand how silly these claims are. The claims I m seeing are, bizarrely, nearly the same as last time and from the same people. Maya prophecy, shady pastors who have bizarre rants on YouTube, and the like. I debunked this stuff back in June 2020 please go read that first but here they are again, using ever so slightly different material.

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