Dan Falk Profile picture
23 Jul, 5 tweets, 3 min read
No-one: Dan, I see the donut-shaped universe idea is back in the news. Didn't you write about that in the last century?
Me: Yes; yes I did. A big eight-page spread in @SkyandTelescope, July 1999, on the topology of the universe: (#space #physics #donuts) Image
And look how they wrapped the headline around the first double-page spread, Pac-Man style. Pretty neat (and apt)! Image
And actually it all started (for me, anyway) with a workshop that @gstarkman organized at @cwru back in 1997. Good (and simpler) times!
Ok, one more thing on the subject of universes and donuts: We all remember that Homer Simpson proposes the idea of a donut-shaped universe to Stephen Hawking (who says he might steal it). So I checked when that episode of The Simpsons aired... (cont'd)
...and apparently it first aired on May 9, 1999. In other words, it aired after I handed in my story to @SkyandTelescope, but before the magazine was actually published. Wacky coincidence! (I guess the idea of donut-shaped universes was "in the air" in those days. :) )

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More from @danfalk

24 Jul
1/n According to numerous colleagues on Twitter, Nobel Laureate physicist Steven Weinberg has died. He was a towering intellect. I'm sure much of the coverage to come will focus on his contributions to science, but (cont'd) (Photo: Jeff Wilson/The Guardian)
2/ ...he was also a first-rate science communicator. His books, and his essays in the @nybooks, were illuminating and authoritative, regardless of the topic.
3/ This is perhaps the most famous -- or infamous? -- thing that he wrote:
Read 18 tweets
28 Feb 20
1. “The Death of a Universe” -- Terrific talk this evening by Dr. Katie Mack (@AstroKatie) at @yorkuniversity. Here are a few highlights. This of course is the CMB, the faint microwave “echo” of the big bang. (cont’d) #physics #astronomy #cosmology (@YorkUScience)
@AstroKatie @yorkuniversity @YorkUScience 2. The big bang happened ~13.8 billion years ago. So what lies ahead? Could the universe collapse in a big crunch? Maybe – but as Prof. Mack explained, it's more likely that it will keep expanding. In fact, the universe is currently not only expanding but also accelerating...
@AstroKatie @yorkuniversity @YorkUScience 3. We seem to live in a universe with a non-zero cosmological constant. Right now, the CC appears small – but in the far future, the CC could come to dominate. That won’t end well! At best, in that scenario, we’re going to freeze to death in the dark...
Read 8 tweets

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