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Totally off-topic thread
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| Voekoevaka | Date: Tuesday, 25.06.2013, 16:38 | Message # 1411 |
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| Quote (DoctorOfSpace) I think that is referencing those old Windows starfield screensavers correct?
Yes.
Quote (DoctorOfSpace) It would take longer than centuries to randomly crash into a star
With 1ly/sec, you're out of the galaxy in 1 day, so good luck to enter another galaxy.
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| DoctorOfSpace | Date: Tuesday, 25.06.2013, 17:04 | Message # 1412 |
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| Quote (Voekoevaka) With 1ly/sec, you're out of the galaxy in 1 day, so good luck to enter another galaxy.
Yeah and you would be moving so fast and space is so vast you would more than likely just zip by stars. You would probably have to fly through the entire observable universe a few times before you hit any stars. Doesn't seem like 20 years would quite cut it.
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| Watsisname | Date: Tuesday, 25.06.2013, 19:32 | Message # 1413 |
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| It would also happen so fast you wouldn't notice the star getting larger before you hit it. 
Sometimes I like to fly through Space Engine in spaceship mode at a few 100 kpc/s, and wait to 'hit' a galaxy. It is many orders of magnitude more likely than hitting a star, but it still takes a while.
Edited by Watsisname - Tuesday, 25.06.2013, 20:12 |
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| werdnaforever | Date: Tuesday, 25.06.2013, 21:18 | Message # 1414 |
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| Quote (Voekoevaka) Randall says that it takes 20 years for that to happen. By using Space Engine, I think centuries should be not enough.
This was the funniest XKCD I have seen in a long time
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| DoctorOfSpace | Date: Wednesday, 26.06.2013, 09:38 | Message # 1415 |
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| HarbingerDawn | Date: Wednesday, 26.06.2013, 17:46 | Message # 1416 |
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No Yandex, that's wrong. It would be 367 days.
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Edited by HarbingerDawn - Wednesday, 26.06.2013, 17:47 |
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| Watsisname | Date: Thursday, 27.06.2013, 01:06 | Message # 1417 |
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| Correct. 
For a planet with prograde rotation,
1/Psid = 1/Psol + 1/Porb
where Psid is the sidereal rotation period, Psol is the length of solar day, and Porb is the orbital period.
If the planet is rotating retrograde, then the sign flips and we instead subtract the last term.
The Earth's sidereal period is ~86164.1 seconds. The orbital period is 3.1558x107 seconds. Solve for Psol in the retrograde case and we get 85929.5 seconds, or 23hr52min9.5sec. So the solar day would be shorter, as one might expect (Earth has to spin through a smaller angle to return to the same orientation relative to the sun).
Now take Porb/Psol and we obtain 367.25 solar days in the year if the Earth spun backward.
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| werdnaforever | Date: Thursday, 27.06.2013, 04:25 | Message # 1418 |
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| Do you guys know what else would happen if the Earth reversed its rotation? Everyone would die horribly as the crust of the earth breaks apart.
Of course, that's besides the point... everyone dies anyway. Sooner or later, due to disease, the breakdown of the human body, extreme physical damage, or suicide from existential boredom, everyone will be have their time. People die, stars die, the universe dies, everything dies; with death, sadness, destruction, the cosmos is an indifferent place and everyone is insignificant and there's taxes and greed and famine and social problems and war and poverty and run-on sentences, and just in case this post has failed to create an emotional reaction within its readers, let me remind us all of unhappy things like kids/babies crying, explosions, and... clogged toilets?
It is my pleasure to say such happy and uplifting things to make everyone feel better about their life and themselves; have a good day everybody 
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| DoctorOfSpace | Date: Thursday, 27.06.2013, 04:38 | Message # 1419 |
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| Quote (werdnaforever) It is my pleasure to say such happy and uplifting things to make everyone feel better about their life and themselves; have a good day everybody
But the fact we die allows us to give life value and, if we so choose, meaning.
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| HarbingerDawn | Date: Thursday, 27.06.2013, 05:35 | Message # 1420 |
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| Quote (werdnaforever) Everyone would die horribly as the crust of the earth breaks apart.
No... the structural integrity of the Earth's crust does not depend on the planet having a prograde rotation.
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| Watsisname | Date: Thursday, 27.06.2013, 07:30 | Message # 1421 |
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| Yep, we'd be just fine if the Earth started out spinning retrograde. If the spin suddenly reversed direction right now though, there would be problems, depending on how sudden the change was. Instantaneous reversal would be an interesting event as everybody suddenly goes flying eastward at up to 930 meters per second. (Brace yourselves, low-latitude peoples.) Would get some nice wave action out of that, too. (Beach party!)
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| werdnaforever | Date: Thursday, 27.06.2013, 14:52 | Message # 1422 |
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| Quote (Watsisname) If the spin suddenly reversed direction right now though, there would be problems, depending on how sudden the change was. Instantaneous reversal would be an interesting event as everybody suddenly goes flying eastward at up to 930 meters per second. (Brace yourselves, low-latitude peoples.) Would get some nice wave action out of that, too. (Beach party!)
This is sort of what I meant about everyone dying horribly
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| HarbingerDawn | Date: Thursday, 27.06.2013, 16:30 | Message # 1423 |
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| If the change was "instantaneous", the entire planet would be destroyed. But talking about instantaneous events of this type is absurd since any possible mechanism for causing such a reversal would take considerable time, and would have little if any harmful effect on the planet or its inhabitants.
Nearly anything that happens "instantly" will be devastating, yet I don't hear predictions of doom for every single action which has ever been mentioned in every post on the forum, hence my objection.
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Edited by HarbingerDawn - Thursday, 27.06.2013, 16:32 |
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| Watsisname | Date: Thursday, 27.06.2013, 20:49 | Message # 1424 |
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| Well yeah, even the word instantaneous is absurd when you really get down to it.
Reversing the Earth's rotation would require an energy comparable to the amount required to melt the whole Earth if it were made entirely of iron (~10%), and since most of the Earth is made of silicate rather than iron, and already very hot in the interior, this fraction is actually much larger and perhaps greater than 1. Comparing to gravitational binding energy it's still a significant 0.17%. So there's no way the spin could be reversed on any sort of rapid timescale without having disastrous results, but I was just having some fun with the notion of everything going flying sideways.
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| HarbingerDawn | Date: Friday, 28.06.2013, 00:06 | Message # 1425 |
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| Quote (Watsisname) I was just having some fun with the notion of everything going flying sideways
If we assumed that the atmosphere followed the surface in this switch, then everyone would be burned up immediately due to their extreme airspeed. Little charred humans flying through the air, bodies being broken by the extreme air resistance. How pleasant.
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