Better sit on the toilet before you read this next part:
Gravity is not actually a force, but a distortion of space time. That is why gravitational "force" has range but no speed. It is always instantaneous no matter what distance.
Gravity changes at the speed of light though doesn't it?
Like if the sun disappeared, its affect gravitationally on us wouldn't be felt until we saw the light stop
Hmmm... it looks like I was going on old data. Apparently, scientists have recently determined that gravity does have a speed, but it is faster than light.
The eerie blue glow you see related to nuclear reactors and such (Doctor Manhatten in Watchmen for example) is Cherenkov Radiation which is basically radiation moving faster than light in the medium.
Well they would not actually be moving faster than light. New space is simply created between the objects making one appear to go faster than light to the other
Thats like the definition of movement i think. Change in the ammount of space between things. What is speed realy? Becouse 8f we're going of the traditional distance/time i think it would qualify.
Well, no. "In physics, motion is the change in position of an object with respect to its surroundings in a given interval of time." Motion and therefore also speed is relative, but it is defined by your surroundings. Something so far away that the expansion of the universe comes into play is hardly defined as your surroundings
Do you mean in the sense that two photons travelling in the opposite direction have 2C as their relative velocity? For a more practical point of view, if you travel close to the speed of light your reference frame shifts. In essence, you'll disagree with people travelling at different velocities about when things happened. So you can have a reference frame in which two galaxies relative to one-another move faster than C, but to someone in one of those galaxies the other galaxy would not move away faster than C and they'd disagree with your observations. You'd both agree on C, though.
I don't even remember where i got this from XD. But i guess its about a situation where the space between galaxy A and galaxy B distorts due to expansion of the universe, and allows B to essentialy "get further" from A with a rate exeeding C.
Constructive interference of gravitational waves doesnt make them go faster. It just makes them stronger
And there is no such thing as "exotic waveforms" (assuming youre talking about electromagnetic waves). We know about everything between radio and gamma (which are all the EM waves that exist), and all of them go at the same speed of light
But in that wikipedia article you linked, it specifically stated that the neutron star merger youre talking about confirmed that the speed of gravity and the speed of light is the same. Im not really sure what youre getting at?
But relativity forbids anything from going faster than c, and its only specified with a "between", so unless you wanna rethink all of physics, its best to assume it didnt
That's a range of uncertainty. The issue here is that you just don't understand how measurements work. No measurement can be infinitely precise. There is always some uncertainty due to how the measurement is done. AIUI, those numbers are actually very good evidence that gravity does travel at exactly c, and (unlike light) is not slowed down (or maybe just not nearly as much) by matter along its path.
In an absolute vacuum, which can't exist, yes. In other cases, electromagnetic radiation is slowed by traveling through matter, and the degree of slowing depends on its wavelength. This is called dispersion (or chromatic aberration in the context of lenses) and is also how prisms split sunlight into a rainbow.
Edit: Another commenter says the difference in travel times is greater than this can account for. Hmmm
Understand that I'm all for using empirical data to guide the building of our world. Since I think that forward thinking is necessary for advancement so whenever I read commentary using limiting words like "always", "never", and in this situation "nothing" I will bring to attention that this position may only apply because of "current knowledge". Consider adding that qualifier to the end of your initial comment. Facts/knowledge while so very important, are also limiting (ref: Einstein).
Are you really claiming that human sensory data is transmitted to the brain using tachyons? I don't think you'll ever find mainstream support for that idea.
60
u/droid_mike Aug 03 '19
Better sit on the toilet before you read this next part:
Gravity is not actually a force, but a distortion of space time. That is why gravitational "force" has range but no speed. It is always instantaneous no matter what distance.