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420chan is Getting Overhauled - Changelog/Bug Report/Request Thread (Updated April 10)
Star showing signs that could be (probably aren't) alien constructions. Ignore Report View Thread Reply
Giuseppe Piazzi - Wed, 14 Oct 2015 13:00:07 EST ID:ruKNVqHw No.55749
File: 1444842007788.jpg -(1059519B / 1.01MB, 1400x788) Thumbnail displayed, click image for full size. 1059519
http://www.slate.com/blogs/bad_astronomy/2015/10/14/weird_star_strange_dips_in_brightness_are_a_bit_baffling.html

> “Aliens should always be the very last hypothesis you consider," Penn State astronomer Jason Wright told The Atlantic, "but this looked like something you would expect an alien civilization to build.”

Basically Kepler has observed a star with dips in it's luminosity exponentially larger than any planet would cause. Even a Jupiter-sized planet would only account for a 1% drop. But the object or objects observed by Kepler cause a drop of up to 22%, indicating an object or cluster of objects roughly half the width of the star itself.
19 posts and 2 images omitted. Click View Thread to read.
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Alan Guth - Sun, 25 Oct 2015 08:37:11 EST ID:sky71Ye7 No.55777 Ignore Report Reply
>>55776
Source?!

Man, if this turns out to be alien stellar engineering, it would be fucking nuts!
>>
Jan Hendrik Oort - Sun, 25 Oct 2015 09:09:54 EST ID:ruKNVqHw No.55778 Ignore Report Reply
>>55777

Links below, but it's now moot. The statement from Gerald Harp of SETI about a repeated signal has been removed from the first link despite being present earlier yesterday. And the second link has another statement from Harp claiming his first statement wasn't accurate and there haven't been any signals at all. So we have two conflicting statements from the same man with the second statement confirming the first ones existence despite attempts to erase it.

Probably just crappy reporting, but backpedaling of this nature happens so often in regards to aliens that a little tinfoil may be permitted. It's up to you what to take from this.

http://www.universetoday.com/122971/seti-institute-undertakes-search-for-alien-signal-from-kepler-star-kic-8462852/
http://www.grenzwissenschaft-aktuell.de/seti-empfaengt-periodische-signale-von-kic-8462852-20151022/
>>
Alan Guth - Sun, 25 Oct 2015 09:32:39 EST ID:sky71Ye7 No.55780 Ignore Report Reply
>>55778
>Awaiting more accurate information about the way the signal before, but from an interview by "UniverseToday.com" by Dr. Gerald Harp from the SETI Institute, shows that it is a "weird periodic signal", " which although potentially natural origin but there is clearly value to examine it more closely. " Besides the natural explanation, so stressed "Universe Today", prefer Harp but also "a distant intelligent source" into consideration.

Google translated it, so sorry for the weird wording. It's interesting though, but a bit surprising that they'd discover a "weird periodic signal" so easily from 1500 light years away just like that. I'm no astronomer or anything though, so what do I know?

About the back-pedaling: I work at a university communication department, and I'd say it's likely to be a journalistic citation error. The paper isn't peer-reviewed yet so there is probably an embargo on details from the SETI study results, which would explain Harp rescinding his earlier statements. As the comment came so early in the publishing cycle of the article they're likely to yet check for errors or anomalies in the study, so making a comment about a detected signal at this point would be very unwise.


Idea for launching small payloads to obrit. Ignore Report View Thread Reply
James Mother Fucking Randi !lwriJ94kMg - Fri, 25 Sep 2015 22:33:15 EST ID:3KDKAApy No.55685
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I've always wanted to build a real rocket that could go to space, but it's far outside of my peasant like budget. So I've thought of what seems like a good idea for a cheap solution to launch vehicles to space.

Use a balloon to lift a small stabilized platform that has a rocket on it. The rocket launches from there into orbit.

And when I use the word platform I don't literally mean a flat launch pad but something that sort of looks like a missile launcher...idk what the technical term for that is...turret?

You could also scale this idea up for conceivably larger loads.
One problem I can see though is when the balloon goes up it would drifts away from the launch site and possibly fuck up your launch.
10 posts and 1 images omitted. Click View Thread to read.
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John Wheeler - Wed, 07 Oct 2015 00:18:27 EST ID:Y//WNNPR No.55743 Ignore Report Reply
>>55742
I believe what they are saying is: this type of flight is not really possible from a simple rocket (unless you happen to have a strong AI laying around and the ability to get it to pilot your rocket, I guess). There are a lot of measurements that have to be taken throughout the flight for numerous different reasons, NASA, et al, have the ability to shine lasers at and from their rockets, along with all sorts of other atmospheric sensors both on the vehicle and on the ground to get very precise measurements which are used during the flight to make sure the vehicle is doing exactly what it needs to be doing at each moment.

A dumb rocket, even one that can generate the speed to get into orbit, is going to have a snowballs chance in hell of actually getting into orbit because it can't make any corrections mid flight; you'd have to get super lucky and have innumerable atmospheric factors be completely optimal for your rockets design for such to work.

Remote piloting or autonomous piloting could be possible if your ship also had the sensors to collect the needed data, but that's far outside of the hobbiest realm.
>>
James Mother Fucking Randi !lwriJ94kMg - Wed, 07 Oct 2015 00:58:46 EST ID:3KDKAApy No.55744 Ignore Report Reply
>>55743
Fuck all that I'll just let it dumb fire and land where it may, weather it's on an orphanage or an embassy. I don't care.

Jokes aside I guess you're right about all that stuff though.
I guess this would be really only useful for short sub orbital flights.
You know, like for sending a go pro or small rodent way up there for pictures and science.
>>
James Mother Fucking Randi !lwriJ94kMg - Wed, 07 Oct 2015 15:52:47 EST ID:3KDKAApy No.55745 Ignore Report Reply
>>55744
After thinking about this more, if I'm only doing sub orbital flights then GPS data should still be useful and viable since it would still be below all the sats.


Theoretic Astrophysics Ignore Report View Thread Reply
John Bahcall - Wed, 30 Sep 2015 21:09:31 EST ID:5ViW/6q0 No.55720
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my new theories in the creation of, and ultimate fate, of our universe. As well as what dark energy really is; and POSSIBLY has something to do with where gravity is permeating into our universe from, since it is weaker than it should be compared to the other forces, even though that really wasn't intended to be included with the rest of the theories. I could be totally wrong on all accounts, but I do love the ideas.Here we go! (Keep in mind that we don't know what the inside of a black hole is like, certainly not a 4D black hole.. the 'polar ends' talked about here could give off gravity due to strange possibilities, like space within space... the 4D black hole that is theorized here to give us our 'spacial plane' could also be sitting inside a spacial plane itself, and it's so large that it reaches the maximum edge of its bending - on the outside of the 4D black hole)

BUT ANYWAY AGAIN, here we go.

Outside of our universe it is theorized that energy is being formed and popping out of existence continuously, at the planck scale. It's theorized this is where our quantum singularity came from. Through quantum tunneling, that tiniest of energy became the singularity that eventually birthed our universe. The problem is we don't know why it expanded in the first place, or why there was more matter than anti-matter as for us to have enough matter, a significant enough amount, as to form galaxies and the universe we know. They believe there are infinite universes, or a multiverse, with every possibility of physics realized. But I'm only concerned with our own, and the answers to these questions. Continue to read and you might agree that it is much easier for our exact universe to continuously be recreated with the exact same amount of matter as this one; which would be highly significant if true because that means the physics that produce life would also be eternally renewed, and without much time needed for it to happen in comparison to random universes. And what a pleasant thought that is.
It is my theory that not only does energy at the planck scale pop in and out of existence, but also multiple singularities constantly coming into existence as well. Keep in mind we do…
Comment too long. Click here to view the full text.
10 posts and 2 images omitted. Click View Thread to read.
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Robert Dicke - Sat, 03 Oct 2015 16:22:31 EST ID:cTrnVs8H No.55735 Ignore Report Reply
>>55733

Why don't you go to school to be a theoretical physicist and then YOU will be that somebody in the field.
>>
Pierre-Simon Laplace - Sun, 04 Oct 2015 17:54:10 EST ID:N+uGi0dP No.55739 Ignore Report Reply
>>55721
can I ask if this fits along with an idea I had where all the planets are mathematically "flat" but they bend away from you the further you go from them?

Like those old drawings of a series of flat disks on top of each other but there are 4D ways to transition from any disk to any other disk without having to go through them (going around planets after they appear sphere like due to distance bending)
>>
Pierre-Simon Laplace - Sun, 04 Oct 2015 17:56:39 EST ID:N+uGi0dP No.55740 Ignore Report Reply
>>55735
$$$$$$


I tried Ignore Report View Thread Reply
Tadashi Nakajima - Sun, 27 Sep 2015 23:01:19 EST ID:NCcXgNdu No.55692
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✓ Overcast
✓ Too late to set up tracking
✓ Sensor needs cleaning
11 posts and 4 images omitted. Click View Thread to read.
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Viktor Ambartsumian - Thu, 01 Oct 2015 16:29:43 EST ID:9+WA5MM9 No.55725 Ignore Report Reply
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DICKS EVERYWHERE
>>
Margaret Burbidge - Sun, 04 Oct 2015 06:22:01 EST ID:UwTIku3P No.55737 Ignore Report Reply
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>>55692
>Using ✓s instead of s
Ban this heretic
>>
George Gamow - Sun, 04 Oct 2015 12:53:54 EST ID:NCcXgNdu No.55738 Ignore Report Reply
>>55717
Satellites would only appear to move in one direction. It was probably some high altitude aircraft or weather balloon.


In the year 2069 Locked Ignore Report View Thread Reply
G - Thu, 01 Oct 2015 01:09:01 EST ID:WHXsRUFD No.55722
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If humans are going to build a city on the moon this century it should definitely be done in 2069, if they do it in 2068 or 2070 instead it will go to waste.

It'll go down as a historical fact until the end of time that the City/Colony was founded in 2069. IMO Earth's Moon is the most romantic spot in our galaxy so it might as well be associated with 69ing.
Locked
Thread has been locked
Thread was locked by: C_Higgy
Reason: /wc/


Becoming a multiplanet species, breaking free from nations. Ignore Report View Thread Reply
George Herbig - Mon, 31 Aug 2015 16:52:15 EST ID:P+fSJ1RL No.55648
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I want to start a discussion of becoming a multiplanet species. Weather that be on Mars, or one of the many Earth sized exo planets. for those let's assume a way to use the Alcubeirre equations has been invented To me moving out of our home planet is an inevitability. What I'm not so sure on is our penchant for clinging to imagined borders.

What is it going to take to break free from that? I could see Mars ending up being its own nationality so to speak. From a governance stand point I can see the practicallity, each planet will mostly be responsible for running it self. The alternative or events leading to that style would be akin to the Roman empire becoming too big to manage.

So yeah, general ideas, hopes, anticipation for how things will be. Discuss becoming a multiplanet species and the evolution of governance that will soon follow.
14 posts and 1 images omitted. Click View Thread to read.
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!qCv3kE3pMI - Wed, 16 Sep 2015 00:27:37 EST ID:M7NMNbPp No.55675 Ignore Report Reply
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gas vapor fed plants and printed meals, who wants to go there when being there is "there"?

p.s. nanana
>>
Daniel Kirkwood - Thu, 17 Sep 2015 00:09:14 EST ID:P+fSJ1RL No.55676 Ignore Report Reply
>>55675
It sounds like a dim prospect. But with enough off hours with allowances for extra activities and maybe even EVAs for no O2 worlds. Could be fun, might be covered by shitty mega corps, but those involved will have to know that they signed up to head a new place to live. They get to forge a new planetary culture, even one day claim sovereignty. The galaxy is a large place and likely hard to govern.
>>
Bernard-Ferdinand Lyot - Mon, 28 Sep 2015 00:42:00 EST ID:AlxomEpB No.55698 Ignore Report Reply
>>55673
Might not be a corporation though. It could be ideological or some psudeo religious movement.


First telescope Ignore Report View Thread Reply
Michael Angelo - Thu, 24 Sep 2015 21:34:55 EST ID:6SPuxxpR No.55682
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Hello, I'm looking for some advice for a first time telescope buyer. I was thinking about buying the Celestron 76mm Firstscope as its not to expensive and if I find that if astrology is not for me it's not really a big loss. Any advice or other telescopes would be great thanks.
>>
Allan Sandage - Sat, 26 Sep 2015 04:08:14 EST ID:NCcXgNdu No.55686 Ignore Report Reply
Dobsonians are going to be the best bang per buck. The larger the aperture, the more light gathering capability it will have. Plan to spend several thousand dollars for astrophotography minus the SLR or CCD to take pictures with. The mount is almost more important than the scope here. A heavy GOTO mount (equatorial pref) with tracking capability is important for taking long exposures although you can take many shorter exposure images and stack them in Photoshop. Store bought refractors are generally garbage. If you really want to go that route Explore Scientific makes some nice refractors. Newtonians are a different story. My nephew's other pop bought him a store bought Celestron Astromaster, and although the mount could blow over like a leaf, the optics on the scope were pretty good. Dobsonians are Newtonians on a lazy Susan like bottom mount with two forks. You can get a large aperture here for comparatively very little cash. The only downside is that it doesn't really lock in place. Besides refractors and newtonians, there are catadioptric cassegrains. These are reflectors like the newtonian, but they are compact and expensive.

tldr: the AstroMaster 114EQ is $200 at opticsplanet.com
Eyepieces cost $50 dollars. Don't start off with a scope that costs the same as an eyepiece.


simply thowed Ignore Report View Thread Reply
sure - Wed, 16 Sep 2015 00:14:31 EST ID:j+4cQgXm No.55674
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a birthday will come


420Sagans Ignore Report View Thread Reply
Joseph Taylor Jr. - Wed, 09 Sep 2015 10:01:09 EST ID:1BegxnY+ No.55664
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Vote for naming the 51 pegasi star 'Carl' and it's 51 pegasi b planet 'Dot'

In honor of Carl Sagan

It's a bit further down on the page



http://nameexoworlds.iau.org/systems/114


Star Gazers Ignore Report View Thread Reply
Giuseppe Piazzi - Wed, 02 Sep 2015 04:30:58 EST ID:NCcXgNdu No.55650
File: 1441182658167.jpg -(447181B / 436.70KB, 1600x1001) Thumbnail displayed, click image for full size. 447181
Any other star gazers out there with telescopes? How far do you have to drive to get to a Bortle scale 2 environment? White being 9 Black being 1.

http://darksitefinder.com/maps/unitedstates-8color.html
>>
Charles Bolton - Thu, 03 Sep 2015 02:43:21 EST ID:lHGvTKQL No.55651 Ignore Report Reply
>>55650
I just have to drive for about 25-30 minutes west on I-70 to get to a Level 1 area out in the middle of Nowhere, KS. There's even some small towns and farming communities nearby where you could get some gas and snacks.

One of the perks of Kansas I suppose.
>>
Jacob Kapteyn - Sun, 06 Sep 2015 06:20:10 EST ID:NCcXgNdu No.55655 Ignore Report Reply
My astronomy club has a dark site, but I have to drive 2 hours to get to it. They have a bunch of concrete slabs where you can set up and they're wired for electricity if you need to power servos on your mount. Some people have their own mini domes set up and there's a small building with a 16" scope and dome. I wish I lived closer to the sticks so I didn't have to drive so far to get a good view of nebula. My dad is originally from Nowhere, KS. I drive through there to pay respect to ghosts occasionally. I wouldn't mind buying a bunch of land and retiring there when I get old.


orbiter 2010 Ignore Report View Thread Reply
James Mother Fucking Randi !lwriJ94kMg - Thu, 20 Aug 2015 05:01:27 EST ID:yA35CPLh No.55604
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Inb4 telling me to post this on /vg/. It's a simulator not a video game. It's serious bzns and no fun is allowed. Besides I've posted it there before and no one there is cool enough to go to be interested in it.

Any one here ever try this out? I got pretty into it a while back. I've used various Delta glider models to launch from cape Canaveral, dock at the iss and then land on the moon at the fictional moon base. I've even made the trip home, but I can't re enter the atmosphere with out computer assistance. I either explode or bounce off the atmosphere every time.

I cant get my head around planning interplanetary trips. The MFD is too obtuse of a tool for me to plan that sort of trip. I wish there was kerbal maneuver node mod that let me visualize the trajectory vissualy with a 3d image rather than a 2d circle on a plane and some numbers.

I haven't tried it in a while and my gaming pc is dead, my lap top wont handle it. I recomend every one check it out as it's free.
12 posts and 1 images omitted. Click View Thread to read.
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James Mother Fucking Randi !lwriJ94kMg - Sun, 23 Aug 2015 21:05:00 EST ID:yA35CPLh No.55617 Ignore Report Reply
>>55615
3d cockpit. My phones auto correct has been taking some creative liberties lately.
>>
Maximilian Wolf - Thu, 27 Aug 2015 16:43:59 EST ID:wl5w5KO5 No.55645 Ignore Report Reply
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>>55614
http://www.orbithangar.com/download.php?ID=6584


I also made an RCMP skin and Hapeg-Loyd cargo transport skin for it too.

But this one I replaced the radiator with solar panels and did up the ings too, which also kinda work as a good heat sheild under it to.
>>
James Mother Fucking Randi !lwriJ94kMg - Tue, 01 Sep 2015 01:49:39 EST ID:yA35CPLh No.55649 Ignore Report Reply
>>55645
noice skin!


Math problem Ignore Report View Thread Reply
Roger Penrose - Fri, 26 Sep 2014 14:29:27 EST ID:vUNowU0Q No.54441
File: 1411756167954.png -(17766B / 17.35KB, 640x558) Thumbnail displayed, click image for full size. 17766
Anyone want to help me out with this problem? I'm new to astronomy/physics and I haven't the faintest.
8 posts omitted. Click View Thread to read.
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Paul Goldsmith - Fri, 24 Jul 2015 21:11:43 EST ID:euFuFwSC No.55558 Ignore Report Reply
>>54441

> A mass is dropped directly on top of a half circle. As it rolls of the side...

Top lel
>>
Edwin Salpeter - Mon, 31 Aug 2015 01:06:20 EST ID:OMGzRHpD No.55646 Ignore Report Reply
1440997580737.jpg -(163342B / 159.51KB, 483x572) Thumbnail displayed, click image for full size.
is mass M a sphere or a cylinder? that changes the moment of inertia and the angular momentum of mass M. you said no friction but it's rolling so I'm lead to believe we are operating under the rolling-without-slipping regime (translational speed 'v' = radius of the mass M 'r' x 'omega', the angular velocity).

set up a force diagram for the mass at location X. the weight force 'mg' points straight down, we'll split into components in a moment. The normal force 'N' of the hemisphere on mass M points radially outward (in this case north-east). We'll be solving for the condition where N --> 0 (i.e., it juuust loses contact with the hemisphere)

cont.
>>
Edwin Salpeter - Mon, 31 Aug 2015 01:26:04 EST ID:OMGzRHpD No.55647 Ignore Report Reply
now the weight force 'mg' can be split into components. one component points radially inward from X with value mgcos(theta). the other component points in the direction of mass M's velocity vector, tangent to the hemisphere or south-east, with value mgsin(theta). the first component balances with the normal force N and provides the centripetal acceleration for mass M. the second component does the accelerating of mass M down the hemisphere.

As >>54457 said, now do the conservation of energy. The translational kinetic energy 1/2mv^2 plus the rotational kinetic energy 1/2Iomega^2 will equal mg(R-y) where y is the height of location X. if you want it dimensionless (R=1) then R-y = 1-sin(theta). make the v = r x omega substitution and solve for v.

the inward radial componenet mgcos(theta) provides the centripetal acceleration v^2/R. So mgcos(theta) = mv^2/R ... too distracted to finish the rest but solve for the max v that the inward radial component can still provide a = v^2/R, then you can solve for the value of cos(theta)


frikkin relativity Ignore Report View Thread Reply
John Wheeler - Sun, 02 Aug 2015 19:56:50 EST ID:Du35j2Lj No.55576
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This has certainly been asked here before but please help me understand this.
A space ship travels around earth near lightspeed. I understand that velocity makes
time aboard the ship seem slower to a spectator on earth. And when the ship stopped moving the crew would have aged less then this spectator. But here's what i dont get. Why does the spectators time also seem to move slower to the crew on the ship? Wouldnt earth look like someone pressed fast forward? But lets say earth time seems to move slower, what happens when the ship slows down, does light from everything that happened come towards it like a flash?
I know i sound dumb, but that's okay.
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Pierre-Simon Laplace - Mon, 03 Aug 2015 06:26:06 EST ID:v2I6+0VG No.55579 Ignore Report Reply
That's not a dumb question at all. In special relativity, there is no preferred reference frame. If a rocket ship is travelling past the Earth, from the rockets perspective, the Earth is travelling past the rocket. So each will see the other's clocks as ticking slower to their own. This symmetry only holds for inertial reference frames though (no acceleration or deceleration). In your example, the space ship is constantly accelerating to move in a circle, and this destroys the symmetry. A more illustrative example is the one of the twin paradox. In the twin paradox, the ship leaves Earth and travels near the speed of light for a while and then turns around and returns to Earth. One twin is stays behind on Earth, and the other travels on the ship. The one who stayed behind on Earth has aged more than the voyager twin. It's a seeming paradox, because each twin witnesses the same thing: the other twin flies off at breakneck speed and returns at the same speed. The difference is that the space ship twin feels an acceleration. It's this acceleration that causes the jump in time - known as gravitational time dilation. This is an aspect of general relativity - beyond the scope of special relativity. So yeah, as soon as the ship starts accelerating or decelerating (as in your example), the events on Earth will play out in fast-forward from the ship's perspective.

https://en.wikipedia.org/wiki/Twin_paradox
https://en.wikipedia.org/wiki/Gravitational_time_dilation
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Grote Reuber - Mon, 03 Aug 2015 08:00:44 EST ID:Du35j2Lj No.55580 Ignore Report Reply
>>55579

Thanks you! That clears my thoughts somewhat. It's still hard to grasp though.
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Fred Whipple - Tue, 25 Aug 2015 23:42:03 EST ID:P+fSJ1RL No.55636 Ignore Report Reply
>>55580
Don't worry. Our brains didn't evolve with innate knowledge of spacetime. Our universe has been what we see for a long long time. Recent science and tools have shown us more cogs of the universe we may never have other wise been made aware of.

That people here can even explain these things is incredible in itself. SpaceTime is no simple algebra that's for sure.


Night v/s day Ignore Report View Thread Reply
Cecelia Payne-Gaposchkin - Mon, 24 Aug 2015 22:12:00 EST ID:Fk84gn/u No.55620
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Hey, so just as here on earth we've got longer days in the summer and longer nights in winter, is there a possibility for a planet, any earth-sized planet, to have a 6 hour day and, I don't know, a 40 hour long night?
1 posts omitted. Click View Thread to read.
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James Elliott - Tue, 25 Aug 2015 01:59:47 EST ID:v2I6+0VG No.55623 Ignore Report Reply
>>55622
To elaborate, I know it's possible because this actually happen on Earth.

https://en.wikipedia.org/wiki/Polar_night
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James Elliott - Tue, 25 Aug 2015 02:01:32 EST ID:v2I6+0VG No.55624 Ignore Report Reply
>>55623
happens*

Time for sleep...
>>
James Mother Fucking Randi !lwriJ94kMg - Tue, 25 Aug 2015 05:31:05 EST ID:yA35CPLh No.55625 Ignore Report Reply
This reminds me of Time cube for some reason.


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