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Today in my general relativity class I got to talk about my favorite SUPER WEIRD COSMOLOGY FACT which is that if you have galaxies of the same size at different distances, beyond a certain distance, the farther away the galaxy is the BIGGER it appears in the sky (!!!)
If you want to dig into the math, you can look up "angular diameter distance", which is essentially a measure of how far away something appears to be based on how big it looks, and you'll find that ang. diam. distance only increases to a certain point, and then it goes down again
The intuitive reason that the most distant things look weirdly large is that the light we're seeing from them is from so long ago that the universe was MUCH smaller back then, so they were actually MUCH CLOSER and therefore covered more of the sky than you'd expect.
Here’s a long-ish excerpt from my book where I talk about THE BIG RIP, one possibility for the end of the universe. (More likely is a Heat Death, caused by endless accelerated expansion, which *doesn’t* rip things apart. But a Big Rip would be fun too.) americanscientist.org/article/tearin…
I just saw a clip of Neil deGrasse Tyson on the Late Show saying that the Big Rip is likely coming and that it’s the necessary result of endless accelerated expansion, neither of which is true! So, see above for clarification.
If you’re interested in reading about what cosmologists are discovering now about how the universe might end, check out my book, “The End of Everything (Astrophysically Speaking)”! It’s accessible and comprehensive and has lots of funny footnotes astrokatie.com/book
You're never too young to learn about the ultimate fate of the cosmos!! 🤩 #EndOfEverythingBook
Update: I have been informed that 7 might be too young to learn about the ultimate fate of the cosmos. Please use the usual parental judgment when discussing cosmic apocalypses with your children.
My 3.5-year-old babynieces are pretty tough, though. I’m sure they can take it. 
My book in title headings and epigraphs: a thread of appreciation for some of the writers who inspired me, and whose words were one way or another apocalyptically appropriate. #EndOfEverythingBook astrokatie.com/book
Chapter 1: Introduction to the Cosmos. Robert Frost, Fire and Ice.
Chapter 2: Big Bang to Now. @ann_leckie, Ancillary Justice.
Here's a thread of reviews of #EndOfEverythingBook -- because they've honestly all been really fantastic and it makes me SO HAPPY to see how much people are enjoying my book now that it's officially out there in the world! ✨📚✨
"'The End of Everything' is a pleasure. Mack’s style is personal and often funny ... I found it helpful — not reassuring, certainly, but mind-expanding — to be reminded of our place in a vast cosmos." -@nytimesbooks
nytimes.com/2020/08/04/boo…
nytimes.com/2020/08/04/boo…
"...like an animated discussion with your favourite quirky and brilliant professor. ... If you need a moment to be distracted from everyday life and journey to the deep cosmic future, I highly recommend 'The End of Everything.'" -@newscientist
newscientist.com/article/mg2473…
newscientist.com/article/mg2473…
Quick thread about my book, "The End of Everything (Astrophysically Speaking)", with FAQ. #EndOfEverythingBook astrokatie.com/book
Q: What's it about?
A: The end of everything! Literally! How the Universe will end, & what that might look like if we were around to see it. There are five possible scenarios covered in the book: Big Crunch, Heat Death, Big Rip, Vacuum Decay, & Bounce. #EndOfEverythingBook
A: The end of everything! Literally! How the Universe will end, & what that might look like if we were around to see it. There are five possible scenarios covered in the book: Big Crunch, Heat Death, Big Rip, Vacuum Decay, & Bounce. #EndOfEverythingBook
Q: Do I have to have an astrophysics background to understand it?
A: Not at all! It's written for a general audience, by which I mean, I won't assume you have any physics/astronomy background. There are some cool/deep concepts in there, but it's accessible. #EndOfEverythingBook
A: Not at all! It's written for a general audience, by which I mean, I won't assume you have any physics/astronomy background. There are some cool/deep concepts in there, but it's accessible. #EndOfEverythingBook
I *just* received the North American hardcover version of my book and it is SO SHINY 🤩
#EndOfEverythingBook
astrokatie.com/book
#EndOfEverythingBook
astrokatie.com/book
So anyway now I'm going to have @AJemaineClement's voice singing "SHINY!" in my head all day
This is a really lovely thread about my book, by @GeneticJen — check it out especially if you’re wondering about the level of technical stuff I cover (and how I talk about it). #EndOfEverythingBook
If you're in the US, try these sites for preordering:
Bookshop: bookshop.org/books/the-end-…
Indiebound: indiebound.org/book/978198210…
& check out the pre-order promotion: astrokatie.com/preorder-promo…
If not, check your local bookstore or links here: astrokatie.com/book #EndOfEverythingBook
Bookshop: bookshop.org/books/the-end-…
Indiebound: indiebound.org/book/978198210…
& check out the pre-order promotion: astrokatie.com/preorder-promo…
If not, check your local bookstore or links here: astrokatie.com/book #EndOfEverythingBook
I'll probably be talking a lot about my book over the next few weeks because (1) I'm SUPER excited to see it out in the world! 😃🎉🚀 & (2) pre-order sales make a big difference for things like convincing bookstores they should actually stock the book! ✨📚✨ #EndOfEverythingBook
Spent some time yesterday doing some recording for the intro to the audiobook version of #EndOfEverythingBook! astrokatie.com/book
In lieu of a recording studio, I have a blanket fort.
It is made of a duvet held up by all my tallest furniture.
Because I am a professional.
In lieu of a recording studio, I have a blanket fort.
It is made of a duvet held up by all my tallest furniture.
Because I am a professional.
#EndOfEverythingBook will be available as an audiobook from @SimonAudio. If you preorder now it will MAGICALLY APPEAR ON YOUR DEVICE on August 4th:
Audible: adbl.co/3f3IvKp
Google Play: bit.ly/2AxulSP
Libro.fm: bit.ly/2O092wn
Audible: adbl.co/3f3IvKp
Google Play: bit.ly/2AxulSP
Libro.fm: bit.ly/2O092wn
To clarify: I’ll be reading the intro chapter and actual professional audiobook narrator @GabraZackman is reading the rest of the book because she is great and also has a home recording studio that is not just bedclothes on lamps. #EndOfEverythingBook
