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Study finds possible alternative explanation for dark energy

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- Tue, 30 Dec 2014 19:38:01 EST ksAXy5yQ No.54870
File: 1419986281805.jpg -(19458B / 19.00KB, 305x244) Thumbnail displayed, click image for full size. Study finds possible alternative explanation for dark energy
http://phys.org/news/2014-12-alternative-explanation-dark-energy.html
>The predicted effects of time being faster in the past would have the effect of making the plot of supernovas become linear at all distances, which would imply that there is no acceleration in the expansion of the universe. In this scenario there would be no necessity to invoke the existence of dark energy.

So pretty much if this is true, Dark Energy doesn't exist and it's observed effects are really caused by time dilation. Hubble expansion is really just an illusion caused by time slowing as the universe ages. We see acceleration at increased distances because when you look farther away it means you look back in time, and time is actually slowing down.

Also, this would imply that as the state of the acceleration is essentially linear, there will be no Big Rip or Big Crunch because the acceleration is not positive or negative. The universe will likely end in a slow Heat Death.
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James Elliott - Thu, 01 Jan 2015 20:38:37 EST XwQwdExC No.54883 Reply
1420162717080.gif -(703718B / 687.22KB, 256x256) Thumbnail displayed, click image for full size.
>>54880
very interesting, thanks for your reply. I find time dilation really fascinating.

About "gravitational time dilation":
What if gravitation was merely a secondary effect of increased time dilation (rather than the other way around, i.e. time dilation being "caused" by increased gravity), with objects having a natural tendency to gravitate towards regions of spacetime with slower time? Do you think this is at all possible?

Even a spaceship traveling at a significant fraction of the speed of light would have greatly increased mass (according to E=mc^2), and therefore would also have a greatly increased gravitational field. In this case, the increased gravity would act like natural "drag" to slow the velocity of the spacecraft down to a more neutral speed (with respect to other moving bodies in the universe). Is it at all plausible to consider that gravity may be a "fictitious force" like we consider the centripetal force to be?

sorry if these are dumb questions
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Giovanni Cassini - Fri, 02 Jan 2015 08:47:54 EST ksAXy5yQ No.54887 Reply
>>54883
If anything, things would seem to move away faster as they move into space that experiences a faster time rate. Oh wait, they already do and this is why we think there's dark energy.

All this still doesn't explain dark matter.
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Henry Russell - Sun, 04 Jan 2015 14:25:15 EST ksAXy5yQ No.54890 Reply
>>54887
Thought experiment, feel free to dismiss this as nonsense.

What if dark matter is somehow linked to the apparent mass increase objects experience as they approach light speed?

In localized areas where the time is not moving faster, objects to not seem to have any increased mass. But more distant objects, which are relatively moving faster and faster away from us approaching light speed more and more, objects are actually apparently gaining mass due to general relativity.

This could be tested by measuring the mass of extremely distant objects over time but I'm afraid it would take too much time, in human years, to observe a change.

Gravity Question

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- Mon, 15 Dec 2014 11:28:17 EST 415JX8nG No.54821
File: 1418660897305.jpg -(18309B / 17.88KB, 450x450) Thumbnail displayed, click image for full size. Gravity Question
Would two colliding gravitational waves exert a tiny force against each other?

If they did at distances where the universe becomes homogenized, could the cumulative force of colliding gravitational waves of the rest of the universe overcome the weak attraction of gravity?

This isn't against dark energy, I was just wondering if it could be a contributing factor.
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Caroline Herschel - Tue, 16 Dec 2014 04:56:03 EST Ncnb3OJc No.54829 Reply
1418723763789.gif -(41331B / 40.36KB, 150x150) Thumbnail displayed, click image for full size.
Gravitational waves don't have a longitudinal component, so they don't cause expansion or contraction of space along the direction of propagation. They cause expansion or contraction perpendicular to the direction of propagation. Pic related, it's what you'd see if a very strong gravitational wave traveled along the line from your screen to your face. It simultaneously expands and contracts in such a way that any area is only deformed, not increased or decreased. There is no unbalanced force, thus, it can't contribute to the metric expansion of spacetime.

Two gravitational waves would not collide, they would constructively or destructively interfere. That means that in some places, the effect in the gif would be amplified, while cancelled out in other places. Interference still wouldn't create unbalanced forces.

Another argument against it being related to the expansion of spacetime is that the strength of gravitation waves are inversely proportional to the distance from the source. The expansion of spacetime, on the other hand, is most significant in areas of low gravity. Galaxies are receding, but not falling apart. Binary stars (which are likely generators of gravity waves) don't repulse other objects or binary stars.

Finally, keep in mind that gravitational waves are generated only by accelerating objects, they only propagate changes in a gravitational field, they're not the carriers of gravity or the dual of gravitons.

Disclaimer: I'm not a physicist nor do I understand the math. This is just what I picked up reading about the topic.
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Bruon Rossi - Sun, 28 Dec 2014 22:33:12 EST 2uBuMclp No.54861 Reply
>>54821
weak or strong gravitational waves exert a force against each other. thats why while you are being pulled to the earth the earth is also being pulled toward you.

Do dwarfs live on Pluto?

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- Wed, 24 Dec 2014 07:31:28 EST PNtK+lw6 No.54857
File: 1419424288937.gif -(1593205B / 1.52MB, 768x432) Thumbnail displayed, click image for full size. Do dwarfs live on Pluto?
Hello.

Today on https://www.kickstarter.com/projects/1520367906/max-navy-1488-space-program there is a project that might tell us why Pluto really isent classed as a planet anymore.

Do anyone know if aliens live on Pluto?

Is NASA refusing to tell us why they really changed what we now say Pluto is?

Is Earth in some sort of conflict with the dwarfs?

I pledged some money and if you just like me want to find out the truh please try to get it 100% funded.
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Joseph-Louis Lagrange - Wed, 24 Dec 2014 13:30:17 EST vud/nmWg No.54858 Reply
dwarf people are not people.

Interstellar Question

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- Wed, 17 Dec 2014 15:42:59 EST 9uY/b809 No.54832
File: 1418848979655.jpg -(18183B / 17.76KB, 204x200) Thumbnail displayed, click image for full size. Interstellar Question
Not here to talk about whether or not it was good movie or not. Just had a question that has me a little baffled.

So they go down on the planet near the black hole with the intense gravity, and they leave the black guy behind. Due to relativity time passes for the black guy much faster than on the distorted planet. So, would the black guy see if he looked down at the planet with a high power telescope? Would they be moving extremely slow or what?
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Bart Bok - Tue, 23 Dec 2014 16:01:11 EST KCC23SOp No.54855 Reply
>>54832
Doesn't matter because they would have never gone to waterworld; the signal would have been "stretched" by gravity as well; they wouldn't be able to receive an affirmative message and if they did it (but they wouldn't) would just be junk. Even the binary pings they were using would be rendered unusable. speculation, but I do have a background in radio communication; feel free to debunk if I'm wrong, but I'm pretty sure I am not.

But yes, he would see their journey unfold at a snails pace, they would look like they were hardly moving.
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Bart Bok - Tue, 23 Dec 2014 20:28:18 EST KCC23SOp No.54856 Reply
>>54855
Addendum to what I said earlier: He may not be able to see them well or even at all; if he can see them at all they will appear to be moving _very_ slowly. A fixed number of photons travel from the planet to the distant observer in orbit, because of the distorting effect in play photons leaving the planet nano seconds after other photons will reach the observer quite a bit after the photons they had been chasing. The guy in space is receiving an hours worth of photons over a 20 year period. That should have an effect on how the entire planet is seen; like it should leave a ghost trail in its orbit or something.

Black Holes and trash compactors

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- Wed, 17 Dec 2014 22:14:24 EST n8sUDEe1 No.54835
File: 1418872464784.jpg -(2835458B / 2.70MB, 4096x3072) Thumbnail displayed, click image for full size. Black Holes and trash compactors
If black holes are at the center of each galaxy, and their gravitational vortex creates the whirlpool spiraling of galaxy arms, then is it possible black holes and gamma ray bursts such as Cygnus X-1 act as garbage disposals or trash compactors and they can get full. Does the pull of a black hole suck in at varying speeds? Do some black holes start slowing down? Is there too much matter in them?

On an unrelated note, my garbage disposal is currently jammed.
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Henry Russell - Thu, 18 Dec 2014 14:29:32 EST YHjXylC8 No.54842 Reply
1418930972040.jpg -(509495B / 497.55KB, 3000x2400) Thumbnail displayed, click image for full size.
>>54838
If there's too much mass being accreted, a portion of the matter being accreted will be ejected, but the size/shape of a body is irrelevant to its gravitational effect on another body, only center of mass and distance.
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Wilhelm Beer - Thu, 18 Dec 2014 19:09:50 EST ksAXy5yQ No.54843 Reply
>>54840
Finally found something similar but it's not what I remember
http://www.nbcnews.com/id/6940627/ns/technology_and_science-space/t/scientists-learn-how-black-hole-stops-itself/#.VJNnNAYDA
More or less if 2 supermassive black holes are merging, the accretion discs can merge into a quazar that will blow all matter away from the holes so nothing will fall into the black holes, effectively neutralizing their pull for a short amount of time.

But this isn't exactly the article I remember. I think I might be suffering from false-memory syndrome which is weird because my memory is usually flawless and I assure you that I'm not just pulling this out of my ass (aka lying).

I really can't find it but I know I fucking saw it. This is frustrating.

Just from my speculation, since Hawking radiation works by 2 entangled particles approaching a black hole and only one falling in, with the other by chance flying off, the black hole loses mass, or that's as much as I understand. If we have a black hole of 10 stellar masses and throw dozens of stellar masses of entangled particles at it, the black hole would eventually evaporate completely because it's natural rate of decay by hawking radiation would have been artificially increased. I wouldn't doubt a type 3 civilization would be capable of destroying a black hole in this manner. But this isn't what I read either.
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Johann Bode - Thu, 18 Dec 2014 20:36:59 EST Ncnb3OJc No.54844 Reply
>>54843
Reading about the quasar phase was interesting, thanks.

> effectively neutralizing their pull
Though the quasar's wind blows gas away and inhibits the growth of the black hole, I don't see it as the black hole losing strength. There are other things (stars orbiting beyond the significant effects of the cosmic wind, dark matter) that continue being dominated by the black hole's gravity. I guess I'm arguing semantics.

> Hawking radiation works by 2 entangled particles approaching a black hole and only one falling in
Entanglement isn't important to Hawking radiation. Virtual particle pairs that occur very close to the event horizon can be split apart by the gravity, with one particle accreted and the other escaping. The infalling particle represents negative energy since they're virtual (add up to 0) and the escaping particle is positive (it carries mass away from the black hole). Virtual particle pairs is just one way of explaining Hawking radiation. Another is quantum tunneling, which allows particles to cross the event horizon without moving faster than the speed of light.

> throw dozens of stellar masses of entangled particles at it, the black hole would eventually evaporate
That wouldn't work. We'd be throwing mass at the black hole and it would grow. Even if we could split virtual particles pairs with an artificial event horizon, any energy we could throw would be positive, meaning the negative half of the virtual pairs would reduce our own mass.

Subject Zero

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- Wed, 17 Dec 2014 20:29:13 EST PNtK+lw6 No.54833
File: 1418866153109.jpg -(75298B / 73.53KB, 1024x768) Thumbnail displayed, click image for full size. Subject Zero
What does this image show really?

I do belive that its space related.
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Vera Rubiin - Thu, 18 Dec 2014 07:02:36 EST ksAXy5yQ No.54839 Reply
>>54834
>a thermal blanket lost during an EVA
Bullshit, who brings a blanket on an EVA?

And if it is a blanket, who let the fucking clown into EVA?
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Henry Russell - Thu, 18 Dec 2014 12:39:10 EST YHjXylC8 No.54841 Reply
1418924350040.png -(975679B / 952.81KB, 1006x500) Thumbnail displayed, click image for full size.
>>54839
Several segments of the station are covered in thermal blankets, some of these need to be removed when connecting segments together.
In at least one case, several parts drifted away due to complications.

iron you say?

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- Wed, 03 Dec 2014 15:37:23 EST PA4ykyUu No.54750
File: 1417639043009.jpg -(16804B / 16.41KB, 300x296) Thumbnail displayed, click image for full size. iron you say?
I've read before that asteroids contain iron, years further back than I can exactly remember... I want to share with you a rant I've engaged on instagram as it pertains to the cyanide found closer to the galactic core.
what if life on Earth came from microbes, and that the conditions on Mars and Venus were too dramatic to allow the evolution of microbes. The first wave of planets to be created by the sun were bombarded by asteroids containing microbial life, and the gravity of the planets became so strong after condensing so much that the small asteroids with little gravity began to rotate around the planets to become moons, but their gravitational field was too weak to contain microbial life, and thus the sun blew those microbes into space. Would microbes survive an impact with rocky terrain, and would the survivors of an impact be the eventual homo-sapien? or would the conditions need be a soft collision with buoyant elements such as plasmic hydrogen gas, or water? or perhaps a large icy meteor containing dna needed melting in the atmosphere of Earth and needed to be so large that the DNA itself would not be destroyed. Well, scientists have discovered that DNA can survive the heat of atmospheric conditions in indirect penetration. It seems that the DNA could not stay attached to the parts designed for wind resistance, but did survive in crevices where wind resistance has little to no factorable value.Well, then we would have to suppose in the case that a requirement is a soft collision that the liquid hydrogen core had since been subjected to temperatures so high that fusion could occur enough times for the core to become Iron, and we physically are not yet capable of testing at that magnitude. But we can use contextual evidence, such like the biogenesis theories that life did sprinkle upon the Earth as mana from the gaseous atmosphere... but what kind of atmosphere would exist strong enough to resist the explosive fusion reactions of Hydrogen to Iron? Well, it seems that iron is a product of lesser resistance to fusion by-product, if you compare the Earth's core to the surface of the sun, where fusion only occurs in the core of the sun and only photons make way to the surface, producing sun spots, the elder definition of dark matter.a plasmic Hydrogen-2 foam core (such like the primordial Helium-4 of plasmic meta-material) could possibly have existed to host microbial life before a fission occurance seperated the hydrogens, to allow a binding with radical oxygens existing in a surrounding foam, preparing to fuse with the hydrogen thus to become H2O water. The fission-fusion process could thus have become the asteroids to bring microbial life to lesser or greater evolved planets which produced iron cores and also carbon, thus exposing DNA to high gravity environments and very few elements, and possibly also carbon, whereupon the DNA binded.it is possible that a group of C4H7, photonic bombardment (electrons with no protons or nuetrons), were met with a single nuetrino for each molecule and thus, a Carbon becomes Nitogen. This must have happened to the first carbon [ to be propyl cyanide (attached to the first carbon)] in half the group, and to the second Carbon, to be isopropyl cyanide (attached to the second carbon), which makes theorizing possible that matter can coexist after certain divine intervention occurs... now the wonder of if the hydrocarbons were seperated and regrouped, and by what, if not by the gravity of the solar system itselfcarbon would need supreme intervention to be able resist the bombarding lower mass elements, to interact with Hydrogen naturally. Hence, the proximity of Hydrocarbonic Cyanide in our galaxy, discovered toward the Gamma-Radioactive Galactic Core. The recent discovery of Cyanide in two different forms (propyl cyanide and isopropyl cyanide) , suggests that indeed Carbon must have existed resistant to ionization in order to retain it's nucleus, either by shape, or pure mass, To exist as C-C=CN-C-H-H-H-H-H-H-H and also CN=C-C-C-H-H-H-H-H-H-H. The composition leaves a very obvious footprint although an equally dark mystery to the workings of the universe. It is possible that hydrocarbons would collect hydrogens until the mass was able to resist oncoming forces of electrons, which reconfigured the propyl structure into half propyl and half isopropyl by the addition and removal of one carbon in one group, with the help of Nitrogen, that came from out of fucking nowher…
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Jan Hendrik Oort - Tue, 09 Dec 2014 09:53:12 EST uyuUt0io No.54786 Reply
1418136792052.jpg -(41171B / 40.21KB, 600x428) Thumbnail displayed, click image for full size.
>>54778
>as I am attempting to undefine the hyperreality of the big bang and relocate the starting point of reality at this known location in the galaxy, where human consciousness could have began subatomically before or during a delineation of self and a host reality.
you're babbling again. simplify your points and theory to the point where they make sense to people who aren't on NBOMe, please, so we can have a discussion
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Hannes Alven - Tue, 16 Dec 2014 09:56:44 EST h1NupmlQ No.54830 Reply
1418741804241.jpg -(53460B / 52.21KB, 600x600) Thumbnail displayed, click image for full size.
>>54778

>The universe being an illusion would prove my theory and my above stated points.

No, it wouldn't. Please, Just stop.
You're not re-writing physics and cosmology, you're just spouting meta-physical bullshit and labeling it a theory.
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Charles Messier - Tue, 16 Dec 2014 11:38:01 EST LjaCs03k No.54831 Reply
1418747881984.jpg -(142248B / 138.91KB, 333x500) Thumbnail displayed, click image for full size.
>>54759

"Mana from heaven," as in fluff from the sky in the bible, as in his allegory to organic chemical rain in the early earths atmosphere as seen on Titan.

So.. flying saucers are a thing.

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- Sat, 13 Dec 2014 17:35:25 EST eMAv2J9C No.54813
File: 1418510125360.png -(157180B / 153.50KB, 902x770) Thumbnail displayed, click image for full size. So.. flying saucers are a thing.
https://www.youtube.com/watch?v=LAdj6vpYppA
and they're powered by laser beams.

"with 2 to 6 better fuel efficiency to the space shuttle"

Just..watch the whole thing, holy shit.
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Johann Encke - Sat, 13 Dec 2014 18:58:03 EST ksAXy5yQ No.54814 Reply
>>54813
This video is ancient.

Also, I've known this for a long time, they run on the same concept as a solar sail.

The object in OP's pic is about the size of a dinner plate.
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William Huggins - Sun, 14 Dec 2014 13:32:16 EST 5O93DDXg No.54818 Reply
>>54814
scale testing or not I want to see the results on the full sized model. Launching a bit of mass isn't hard. But launching the larger mass of a fully space ready rocket is another issue.
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Joseph Taylor Jr. - Sun, 14 Dec 2014 14:43:36 EST eMAv2J9C No.54819 Reply
1 year later (scaled up model)
https://www.youtube.com/watch?v=5_9ac-w4DW8

Apparently this is considered a "Lightcraft" and it's distinct from solar sails because it's dependent on the expansion of reaction mass to accelerate rather than being accelerated by light pressure alone.

not a lot of news on this, probably not a feasible project to "launch satellites into orbit within 10 years"

Space is interesting

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- Wed, 10 Dec 2014 17:11:27 EST R7ksFdp2 No.54798
File: 1418249487586.jpg -(855748B / 835.69KB, 2560x1600) Thumbnail displayed, click image for full size. Space is interesting
I really want to learn more about space, /sagan/ but the sheer vastness of the amount of information on the subject is just overwhelming to me. I could spend a lifetime just literally reading about space, different theories, the math involved with space and space travel, how stars work, if interdimensional travel is possible, astral planes... Just all of it. And to be honest it's very humbling but yet it puts things into perspective. We are less than a fraction than a blink of an eye in age to the universe, and we are beyond microscopic because the universe is so vast but yet, it would take millions of years to reach the farthest depths. Maybe I'm over-thinking this but space is just mystifying to me and there's so much to learn and I don't know where to start.
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Caroline Herschel - Wed, 10 Dec 2014 20:38:40 EST 4HbkLal6 No.54799 Reply
>>54798
>>where
"to start"

does it actually matter? I mean, truly? On a cosmic scale, geographically or in size? Duration?

Space is pretty fucking interesting man.
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Riccardo Giacconi - Wed, 10 Dec 2014 20:50:24 EST 9uY/b809 No.54801 Reply
Watch Cosmos, new and old. Read books by Sagan, Hawking, Tyson.
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John Bahcall - Thu, 11 Dec 2014 05:04:55 EST R7ksFdp2 No.54802 Reply
>>54801
I'm going to start with those, and any other documentaries on like the history channel or discovery cause those are interesting too when they actually play them and not reality tv because everyone on cable is a sellout.

high boy

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- Mon, 08 Dec 2014 02:54:07 EST PCHvbwVp No.54779
File: 1418025247741.jpg -(99472B / 97.14KB, 1024x600) Thumbnail displayed, click image for full size. high boy
Im high off weed and painkillers right now, someone tell me what's up with other life forms in another galaxy..When will we finally come in to contact with another earth like planet? :(i
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Edward Barnard - Tue, 09 Dec 2014 14:30:17 EST H3af7FdZ No.54788 Reply
>>54787
Lockheed Martin CEO here, most of this money, not counting bonuses, fraud and blow, goes towards killing babies for oil and satanic gratification within the limits of physics, available energy and material technology. Sorry.
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Bernard Burke - Tue, 09 Dec 2014 18:53:03 EST ksAXy5yQ No.54789 Reply
>>54787
When you have studied the progress of science and technology for as long as I have, predicting the future becomes an art form.

Plus you have to understand that we're on an exponential curve with our progress, not a linear. If it were linearly, it would be hundreds of years, at this rate a quantum AI will invent warp travel in less than 100. It won't even be invented by humans, it will be invented by a machine.
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James Elliott - Wed, 10 Dec 2014 01:15:47 EST Zbe0PVOU No.54792 Reply
>>54787
If we're going to be the world's greatest superpower, we damn well better have defence at the top of our priorities. Money well spent if you ask me. And as you said, it's advancing our technology at a breathtaking pace. The ISS is the public relations arm of our space program, in case you didn't know.

Space: The Final Fronteir

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- Sun, 07 Dec 2014 14:43:06 EST 2gyC10rH No.54773
File: 1417981386115.jpg -(1033163B / 1008.95KB, 4256x2832) Thumbnail displayed, click image for full size. Space: The Final Fronteir
In1967, The Outer Space Treaty held that everything in the solar system, except Earth itself, is the property of everyone in the world and no one country.

What does this mean about future space colonization? Can we not claim areas to develop and utilize? Or will we just disregard this, place weapons and begin star wars for land?
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Mike Brown - Sun, 07 Dec 2014 17:32:32 EST yZpPrhjN No.54777 Reply
>>54773
That treaty served as a means for big countries to mutually stop each other from doing stupid things during that era.

Future agreements, over how sovereignty of space colony functioned, will likely emerge from, how countries will be dealing with artificial islands and floating cities on Earth's ocean in coming era.

who will join my army to destory the moon

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- Sun, 14 Sep 2014 16:42:16 EST EVyOC35t No.54391
File: 1410727336207.jpg -(127617B / 124.63KB, 640x654) Thumbnail displayed, click image for full size. who will join my army to destory the moon
jesus fuck I hate the moon

look at it sitting up there and being lazy while I have to work all day

I cant wait until im rich and powerful and can finally deal with the moon...

Whats our game plan guys we need to move quick so IT cant stop us
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Clyde Tombaugh - Thu, 13 Nov 2014 16:35:27 EST m2V5EK+8 No.54675 Reply
1415914527855.jpg -(57706B / 56.35KB, 335x488) Thumbnail displayed, click image for full size.
Stay the fuck off my moon, filthy peasants.
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Friedrich Bessel - Sun, 16 Nov 2014 07:25:43 EST wK+Onyuj No.54693 Reply
>>54692
I guess the light of that event hasn't reached Earth yet.
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