So, I was smoking with my dad the other day, and he asked me a seemingly simple question: “If a black hole appeared in this room, right now, would the effects of the black hole be felt instantly?”
Would it take time for gravity to reach you from the black hole in the center of the room, to you sitting on a couch against the wall?
It takes light time to travel, and they say there is nothing faster than light, but could it be that some effects we’ve never been without could be instantaneous?
Perhaps if one were to truly understand the effects of gravity, or even create synthetic gravity, it would open up the possibility to communicate instantly across the universe, perhaps even travel great distances.
Though, I wouldn’t even know how to set up an experiment where something wasn’t exposed to gravity to begin with.
@blankey, The nobel prize was for the observation that the universe is expanding at an accelerating rate.
I believe that the hypothesis that space itself is expanding is yet to be really tested, it is only one explanation for the accelerating rate (aka dark energy).
@blankey, Its not – that is an implication that if space itself is expanding, then things could move apart from each other at the speed of light.
No one has observed anything moving faster than the speed of light, galaxies, particles, anything.
@ijesuschrist, Actually, the speed of light fluctuates. It often times, perhaps even multiple times a day, moves “faster” than itself, even though, obviously, that is impossible.
And yes we have. Ever heard of Quantum Entanglement? Electrons that should have no apparent communication between the two instantaneously (faster than the speed of light) mirror each other.
@blankey, Going to back up that first statement with any evidence?
The second statement – nothing appears to be moving faster than the speed of light, hence they call it entanglement. The two things are entangled, no matter the distance between. But nothing seems to be moving.
@ijesuschrist, Yes, they call it entaglement but that does nothing. That is a word. And when you ask again and again, most scientists will say “spooky action at a distance” or whatever the saying is. Which, again, serves nothing.
And for my first statement just go research how they find the “constant” of the speed of light. They have labs set up around the globe, labs that get different readings, sometimes different throughout the day, and then come together for an average (which in my opinion is stupid, although useful for equations). The speed of light changed its “constant” in lie the 20s or 40s or some shit. It fluctuates.
@blankey, It changed its value in the 20’s or 40’s because they had a better method for measuring it.
Its the same as in 1920 they had a scale that measured a gram, it was exactly one gram.
Then they invented a better scale, and now they realized their ‘exact’ gram was off by 1/10000 of a gram, so they changed the value of a gram.
This repeats, until we get better and more accurate values for a gram, the same happens with all constants and all technologies. This isn’t hard to understand, is it?
There are other ways to change the speed of light, but the fundamental velocity of light is unchanged. Since there is no perfectly empty vacuum, you can never really accurately get a reading of the speed of light – it will fluctuate, just as the static on your radio is constantly changing – the “background” or “noise” will always influence your read-out.
When people say “there are things that go faster than the speed of light”
1) They don’t understand what they are really saying
2) They have some information I’ve never seen before and would love to see
@ijesuschrist, Still, no one can explain quantum entanglement fully. Either Einstein was wrong or some weird shit is happening that we can’t fully explain. Probably both.
And sure that may be why but the speed of light indeed fluctuates probably due to us flying through fucking space and what not. It isn’t only just due to the equipment.
and interesting link, thanks.
@blankey, The speed of light (in a vacuum) is a constant. Nothing can go faster than light. Period. The speed of light can be “slowed” if you shine e.g. a laser through a certain substance (I really don’t remember the specifics; I bet you could find the article about the scientist who is famous for researching this if you use google). I put slowed in quotation marks because it only appears slower than normal— the actual light rays are bouncing around the atoms of the substance at the normal speed of light, but the amount of collisions with atoms and a couple other factors is what makes the light appear to move slower on our scale. Point is, light travels at lightspeed. Nothing else can travel at/above lightspeed.
As for quantum entanglement, the two particles are simply “connected”. They are not communicating over a long distance at all, they are just simply connected to each other regardless of the distance between them. Even when you collapse one particle into a certain state causing the other to collapse into the opposite, particle #1 does not send some kind of message over the distance between itself and particle #2, they are just connected. In case you’re thinking of the idea, entanglement can not be used for faster than light communication. No measurable & comparable information can be obtained unless you observe both particles and then compare measurements, which can only be done slower than lightspeed.
@pretty-much-everyone-else-on-this-thread-except-i-jesus-christ, We can say “Perhaps this… Perhaps that… What if…” but it doesn’t change the fact that we know quite a bit already about how black holes, gravity, and entanglement work, as well as the forces that have to do with them, so a physicist (or a physics-forums search) could answer your questions or prove/disprove most of your speculations.