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Theoretic Astrophysics by John Bahcall - Wed, 30 Sep 2015 21:09:31 EST ID:5ViW/6q0 No.55720 Ignore Report Reply Quick Reply
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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…
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Bernard Burke - Sat, 03 Oct 2015 00:51:43 EST ID:5ViW/6q0 No.55732 Ignore Report Quick Reply
That's your problem for not paying attention to the theoretic astrophysics community and how singularities come to be when there is nothing present, or the multiverse theories. Which is also why you don't understand that not all hypothesis of these people is always laid out by math. You have to create your own clues before going into the math. I don't expect everyone here to understand that.
Bernard Burke - Sat, 03 Oct 2015 00:55:53 EST ID:5ViW/6q0 No.55733 Ignore Report Quick Reply
Though yes you are correct, my biggest problem facing me starting out here is why the singularities would ever collide. The exotic properties within this multiverse sheet reacting with a singularity that mostly exists within nothingness, and before having the coined 'spacial plane', will be impossibly hard to flesh out further. I'd have to get the attention of someone within the field.
Robert Dicke - Sat, 03 Oct 2015 16:22:31 EST ID:cTrnVs8H No.55735 Ignore Report Quick Reply

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 Quick Reply
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 Quick Reply

I tried by Tadashi Nakajima - Sun, 27 Sep 2015 23:01:19 EST ID:NCcXgNdu No.55692 Ignore Report Reply Quick Reply
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✓ Overcast
✓ Too late to set up tracking
✓ Sensor needs cleaning
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Joseph Taylor Jr. - Wed, 30 Sep 2015 15:34:50 EST ID:mfxeJeEW No.55719 Ignore Report Quick Reply

I figured it was sunlight hitting the panels, I just haven't seen too many satellites personally, and I've never seen any get real bright and dim out twice within such a short time. Like I said, it could've been my brain playing tricks on me, but my girlfriend said she saw it change direction as well. It was like when you're going into an S-curve on a street. Just kinda veered west for a moment and then back to the original position heading south. Thanks for the explanation though. I'll keep that in mind.
Viktor Ambartsumian - Thu, 01 Oct 2015 16:24:49 EST ID:9+WA5MM9 No.55724 Ignore Report Quick Reply

that sounds like an iridium flare. But also could have just been a tumbling satellite that reflects sunlight, since you said the brightness arced more than once.
Viktor Ambartsumian - Thu, 01 Oct 2015 16:29:43 EST ID:9+WA5MM9 No.55725 Ignore Report Quick Reply
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Margaret Burbidge - Sun, 04 Oct 2015 06:22:01 EST ID:UwTIku3P No.55737 Ignore Report Quick Reply
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>Using ✓s instead of s
Ban this heretic
George Gamow - Sun, 04 Oct 2015 12:53:54 EST ID:NCcXgNdu No.55738 Ignore Report Quick Reply
Satellites would only appear to move in one direction. It was probably some high altitude aircraft or weather balloon.

In the year 2069 by G - Thu, 01 Oct 2015 01:09:01 EST ID:WHXsRUFD No.55722 Locked Ignore Report Reply Quick Reply
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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.
Thread has been locked
Thread was locked by: C_Higgy
Reason: /wc/

Becoming a multiplanet species, breaking free from nations. by George Herbig - Mon, 31 Aug 2015 16:52:15 EST ID:P+fSJ1RL No.55648 Ignore Report Reply Quick Reply
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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.
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Gerard Kuiper - Sat, 12 Sep 2015 01:17:29 EST ID:BF8zYeiD No.55672 Ignore Report Quick Reply
What would be the point? A corporation exists to make money. There's no profits in piling the resources it would take to own/run a planet that most of the human population would never visit. RIP Planet Starbucks.
Antony Hewish - Mon, 14 Sep 2015 22:09:19 EST ID:P+fSJ1RL No.55673 Ignore Report Quick Reply
Most likely it would be the larger industrial corporations. Not many of those exist with an interest in space, yet. Unless in the future a multicorp with industrial, exploration, and Scientific interests exists. It may end up being large enough to fund an employee colony. Though it will be results driven and may not be intended to include civies, perhaps family would be counted in rare cases.
!qCv3kE3pMI - Wed, 16 Sep 2015 00:27:37 EST ID:M7NMNbPp No.55675 Ignore Report Quick 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 Quick Reply
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 Quick Reply
Might not be a corporation though. It could be ideological or some psudeo religious movement.

First telescope by Michael Angelo - Thu, 24 Sep 2015 21:34:55 EST ID:6SPuxxpR No.55682 Ignore Report Reply Quick Reply
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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 Quick 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 by sure - Wed, 16 Sep 2015 00:14:31 EST ID:j+4cQgXm No.55674 Ignore Report Reply Quick Reply
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a birthday will come

420Sagans by Joseph Taylor Jr. - Wed, 09 Sep 2015 10:01:09 EST ID:1BegxnY+ No.55664 Ignore Report Reply Quick Reply
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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


Star Gazers by Giuseppe Piazzi - Wed, 02 Sep 2015 04:30:58 EST ID:NCcXgNdu No.55650 Ignore Report Reply Quick Reply
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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.

Charles Bolton - Thu, 03 Sep 2015 02:43:21 EST ID:lHGvTKQL No.55651 Ignore Report Quick Reply
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 Quick 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 by James Mother Fucking Randi !lwriJ94kMg - Thu, 20 Aug 2015 05:01:27 EST ID:yA35CPLh No.55604 Ignore Report Reply Quick Reply
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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.
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James Mother Fucking Randi !lwriJ94kMg - Sun, 23 Aug 2015 19:43:32 EST ID:yA35CPLh No.55615 Ignore Report Quick Reply
I cant remember the ship i used that had a mostly w Orrin 3d compo. You guys know a good one that dosent having me switching between 2d and 3d cockpits?
Henry Russell - Sun, 23 Aug 2015 20:14:37 EST ID:P+fSJ1RL No.55616 Ignore Report Quick Reply
Kind of but not really. Naal fights happen at 2d movement options where as space has 3d of movement available during engagements. Take orbit inclination into account and time your approach just right and you can approach any enemy form any direction. Almost. Timing and starting positions for intercept burns highly dictate how and when you engage targets. Not to mention you can use those 6 major directions, a combination of 360 degree lateral and vertical to your perspective, to dodge incoming fire. Though you may be fighting in large space ships you are still going super fast.

In some ways, yeah naval combat but in space, many of the principles are the same once the shells start flying or even before as both fleets race to lock targets first. There is just a little extra to consider.
James Mother Fucking Randi !lwriJ94kMg - Sun, 23 Aug 2015 21:05:00 EST ID:yA35CPLh No.55617 Ignore Report Quick Reply
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 Quick Reply
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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 Quick Reply
noice skin!

Math problem by Roger Penrose - Fri, 26 Sep 2014 14:29:27 EST ID:vUNowU0Q No.54441 Ignore Report Reply Quick Reply
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Anyone want to help me out with this problem? I'm new to astronomy/physics and I haven't the faintest.
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Edwin Hubble - Fri, 26 Jun 2015 17:37:01 EST ID:v2I6+0VG No.55457 Ignore Report Quick Reply
Please don't necrobump old threads.
Edward Pickering - Sun, 05 Jul 2015 07:31:07 EST ID:sVia2s64 No.55471 Ignore Report Quick Reply
actually it won't, because of uncertainty principle you can't make it stand perfectly still perfectly at the top
Paul Goldsmith - Fri, 24 Jul 2015 21:11:43 EST ID:euFuFwSC No.55558 Ignore Report Quick Reply

> 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 Quick Reply
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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)

Edwin Salpeter - Mon, 31 Aug 2015 01:26:04 EST ID:OMGzRHpD No.55647 Ignore Report Quick 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 by John Wheeler - Sun, 02 Aug 2015 19:56:50 EST ID:Du35j2Lj No.55576 Ignore Report Reply Quick Reply
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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.
Henry Draper - Sun, 02 Aug 2015 22:38:40 EST ID:415JX8nG No.55577 Ignore Report Quick Reply
>Why does the spectators time also seem to move slower to the crew on the ship?

It doesn't.
If you went 99.999...% the speed of light, you would actually distort time enough that you could travel around the universe in your relative lifetime, but here's the kick, if you traveled a billion light years in space, even though it only seemed like a year or whatever to you, the universe itself would of aged that much.

In order to travel near light speed, you would need some kind of super computer to figure out where your destination would actually be, if you go to something 1000 light years out, you would have to know were exactly that object would be in 1000 years, and when you arrived, it would be 1000 years later, 2000 round trip.

You could fly around the universe in a single year in your perspective, but when you got back home it would be billions of years later and our planet and the universe as it exists today would be long gone.
Henry Draper - Sun, 02 Aug 2015 22:57:47 EST ID:415JX8nG No.55578 Ignore Report Quick Reply
Space and time are the same thing: the more space you travel, the more time has gone by, hence spacetime.
You can travel arbitrarily fast into the future
Pierre-Simon Laplace - Mon, 03 Aug 2015 06:26:06 EST ID:v2I6+0VG No.55579 Ignore Report Quick 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.

Grote Reuber - Mon, 03 Aug 2015 08:00:44 EST ID:Du35j2Lj No.55580 Ignore Report Quick Reply

Thanks you! That clears my thoughts somewhat. It's still hard to grasp though.
Fred Whipple - Tue, 25 Aug 2015 23:42:03 EST ID:P+fSJ1RL No.55636 Ignore Report Quick Reply
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 by Cecelia Payne-Gaposchkin - Mon, 24 Aug 2015 22:12:00 EST ID:Fk84gn/u No.55620 Ignore Report Reply Quick Reply
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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?
James Elliott - Tue, 25 Aug 2015 01:47:54 EST ID:v2I6+0VG No.55622 Ignore Report Quick Reply
It depends entirely on the observer's location on a planet. So while the days may be longer and the nights shorter in the northern hemisphere, the situation will be reversed in the southern hemisphere. And it depends on your exact latitude (how far north or south you are). I can tell from the information provided to your hypothetical planet must have a 46 hour day (46 hours from one high noon to the next). This means that your planet is rotating slower than Earth, orbiting its sun faster, or both. Now for the 6:40 ratio, this depends mostly on the tilt of the axis about which the planet spins wrt its sun. If we knew the latitude where this day/night cycle occurs and at what time of the year it occurs, we could work out approximately the tilt of your planets axis. This is assuming that the length of a day is much shorter than the length of a year for your planet and that there is a great distance between your planet and its sun.

tl;dr Yes it's possible.
James Elliott - Tue, 25 Aug 2015 01:59:47 EST ID:v2I6+0VG No.55623 Ignore Report Quick Reply
To elaborate, I know it's possible because this actually happen on Earth.

James Elliott - Tue, 25 Aug 2015 02:01:32 EST ID:v2I6+0VG No.55624 Ignore Report Quick Reply

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

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