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Don't Tell Einstein, but Black Holes Might Have 'Hair'

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Identical twins have nothing on black holes. Twins may grow from the same genetic blueprints, but they can differ in a thousand waysâfrom temperament to hairstyle. Black holes, according to Albert Einsteinâs theory of gravity, can have just three characteristicsâmass, spin and charge. If those values are the same for any two black holes, it is impossible to discern one twin from the other. Black holes, they say, have no hair.
âIn classical general relativity, they would be exactly identical,â said Paul Chesler, a theoretical physicist at Harvard University. âYou canât tell the difference.â ....

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The Physics of Reddit's Spinning Solar System Icon

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While waiting for Reddit to load on my phone, I wondered if I could do some physics with the loading icon. Maybe you ve seen it. It looks like a mini solar system with four planets (two inner planets and two outer planets). Let s model it!
Video: Rhett Allain via Reddit
We should start with some data. I can do a screen capture of the loading screen and then use my favorite video analysis program (Tracker Video Analysis) to get position and time data. Of course, the screen shows distance in units of pixels and that s not very useful. I don t know the actual size of this “planetary system” (or whatever it is), so I will just set the scale size to 1 outer orbital diameter unit. This is the distance across the whole orbit of one of the outer “planets. ....

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The Milky Way Gets a New Origin Story

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When the Khoisan hunter-gatherers of sub-Saharan Africa gazed upon the meandering trail of stars and dust that split the night sky, they saw the embers of a campfire. Polynesian sailors perceived a cloud-eating shark. The ancient Greeks saw a stream of milk,
gala, which would eventually give rise to the modern term “galaxy.”
Quanta Magazine, an editorially independent publication of the Simons Foundation whose mission is to enhance public understanding of science by covering research developments and trends in mathematics and the physical and life sciences.
In the 20th century, astronomers discovered that our silver river is just one piece of a vast island of stars, and they penned their own galactic origin story. In the simplest telling, it held that our Milky Way galaxy came together nearly 14 billion years ago when enormous clouds of gas and dust coalesced under the force of gravity. O ....

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