Explain xkcd: It's 'cause you're dumb.
This comic refers to a common analogy used to explain how mass distorts space-time - a bowling ball resting on a sheet of rubber distorts the sheet due to its weight. Mass acts in the same way - mass results in distortion of space-time.
The next part of the original analogy explains a black hole: the slope of the sheet becomes so deep that you can't climb out from the bottom anymore, similar to a black hole, which even light can't escape from. However, the comic subverts the analogy, and the sheet becomes a trampoline instead.
The line "Imagining is fun!" is also an hommage to Richard P. Feynman's "Fun to Imagine" Series of Interviews.
Imagining is fun, but there's always got to be a spoil sport.
- [Beret guy is standing on a giant bowling ball on a rubber sheet. Megan is watching.]
- Beret Guy: Imagine a giant bowling ball on a rubber sheet.
- Beret Guy: The ball's weight makes a dent in the sheet.
- [A rope is pulling the ball down into the sheet.]
- Beret Guy: Now imagine a rope that pulls the ball down even further.
- Beret Guy: ...Annnnd...
- [Rope lets go. Ball is catapulted with Beret Guy on it.]
- Beret Guy: Wheee
- [Beret guy and ball are falling back down.]
- Megan: ...Oh. I thought this was about physics.
- Beret Guy: Imagining is fun!
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There is no rope in black hole analogy. On the other hand ... maybe one day this becomes common analogy for explaining some method of FTL travel ... -- Hkmaly (talk) 08:52, 9 January 2013 (UTC)
It is no rope - it is a rubber sheet seen from the side. Sebastian --22.214.171.124 14:01, 9 January 2013 (UTC)sorry, you meant the rope there ;-) Sebastian --126.96.36.199 20:18, 9 January 2013 (UTC)
Did you see the harmonics of the wave? I think there are four different ones in the third frame. Sebastian --188.8.131.52 14:01, 9 January 2013 (UTC)
- Two harmonics, two different phases of each. 184.108.40.206 15:56, 9 January 2013 (UTC)
It seems to me there should be a cross-reference to 895: Teaching Physics (and if I knew more about the conventions of this wiki I would be bold and add it myself... but I don't, so I won't.) --220.127.116.11 17:35, 9 January 2013 (UTC)
- Furthermore, you could see the "BOOOIING" in this comic as an alternative to the "Boooooring" (only one-letter difference) at the end of 895: Teaching Physics : Instead of becoming boring after "...Annnnd..." cliffhanger, the demonstration becomes really fun. Anyone to add that point in the explanation if relevant ? --KoundelitchNico (talk) 09:36, 24 September 2014 (UTC)
I made a playlist of the mentioned "Fun to Imagine" series of videos:
Deelkar (talk) 03:16, 10 January 2013 (UTC)
Well I made a rebuttal of Einsdynamics:
Gravity first, luser! I used Google News BEFORE it was clickbait (talk) 18:57, 13 January 2015 (UTC)