Black Holes: Crash Course Astronomy #33

We’ve covered a lot of incredible stuff, but this week we’re talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form when a very massive star dies, and its core collapses. The core has to be more than about 2.8 times the Sun’s mass to form a black hole. Black holes come in different sizes, but for all of them, the escape velocity is greater than the speed of light, so nothing can escape, not matter or light. They don’t wander the Universe gobbling everything down around them; their gravity is only really intense very close to them. Tides near a stellar mass black hole will spaghettify you, and time slows down when you get near a black hole — not that this helps much if you’re falling in.



179 thoughts on “Black Holes: Crash Course Astronomy #33

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  21. I just had a conversation today with a Christian Science friend about why we need church. And then I read this.Thank you for this article, Michael. I’m grateful to the Publishing Society for the openness that invites and embraces honest sharing. Rob wrote, “I am so grateful to all the Christian Scientists who showed love and kindness to me on that visit.” I am too, Rob!The world needs THIS church, the one exemplified on this page. Thanks to all of you who make it what it is.With love,Pamela  |  

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  28. C’est marrant vous identifier aux communistes des années 1920 ça vous va mais quand on aborde les périodes plus récentes il y a plus personne…Et puis « Le Pen Mélenchon même combat » mais oui tout à fait! Il n’y a qu’à voir la même haine maladive pour les médias et cette volonté commune de se croire dépositaire de la voix du « peuple » alors qu’on en représente qu’une minorité.

  29. John,As a former practitioner of conservative theology, I can authoritatively guess that the Acton Institute considers voting for Democrats a venial sin and supporting tax increases on the rich a mortal sin.Since you likely are guilty of both, it doesn’t really matter, does it?See you in hell, my friend.Duane

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  35. 18/01/2011 – 1:55amMaravilloso en el MArca TV PIPI gritandole al jefe, que ya estaba bien de que las entrevistas a Mourinho se las hagan los periodistas de rodillas. Que las entrevistas hay que hacerlas de pie o sentado pero nunca de rodillas.Y el otro, diciendole que cuidado que llevaba 3 rajadas.COJONES PIPI!

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  41. they want stories up to a certain length, they will NOT make exceptions for a much longer story, however good it is. They won’t even bother to read it. Sounds harsh, but they just don’t have the time to spare. You are better off finding a market which does take stories of that length. Or see if you can split it up to make a serial.Good luck and keep writing!

  42. Congratulations Jagan and Jayamma garu. Whole Indian politics to learn how to win the people to achieve goals. I hope Sonia and Senior citizens of congress, and other party should learn how to work dynamically. They should think to give the politics and leading to young people who has commitment / kind / development of country. Do not go to the politics to culprits.

  43. The McCain camp must not follow sports because if they did, they’d know that Philly fans don’t give a fuck about who they boo. I saw the footage over the weekend and the boos far outnumbered any cheers there may have been. The boos were probably even more pronounced in person. Oh and by the way, it isn’t just you… the McCain campaign seems to have a different tact every day.

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  47. JANET SHAN Dorian — Yes, I visit her site fairly often and I was surprised to see she was quiet as a mouse on the topic. Charles Krauthammer, one of the leading conservatives, expressed shock at Mitt Romney’s horrible performance. It’s just embarrassing on all levels.

  48. Thanks Shellina and Isa. The movie is going to be broadcast on Wednesday in Second Life. Maybe we can get a public viewing set up if there is interest. It's 91 minutes though. Kind of weird to think of me watching my avatar watching a movie in second life of real life people becoming avatars.

  49. De puta madre la mani, con animacion, musica y todo. La verdad es que estuvimos mas de lo que yo esperaba. Felicidades a la asamblea del Kanaya porque con pocos recursos se lo han currado mucho, y, bueno, a mirar otros locales, un desalojo otra okupacion. Por cierto, al pringao de dn: Lo de burgos es uno de los mayores tufos que habeis preparado. Resulta que tras “Una brutal paliza con barras de hierro” el tio solo tiene un moraton en la espalda. Fijo que habeis sido vosotros mismo.

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  53. Yo sé que hay un túnel secreto entre la escuela Magdalena de Canossa (149 y 64, más o menos, no me acuerdo de la dirección exacta) y el Seminario Menor (Escuela Agustín Roselli) que se encuentra frente a la escuela de monjas.Fue descubierto en un allanamiento hace varios años.

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