###### What would be the speed of light in a black hole?

Speed of light remains same in a black hole as it is anywhere else. Speed of light cannot be changed by any means, wherever you look, whenever you look. You can't see light coming from a black hole because the gravitational field of the black hole is so strong, up to its

###### Why the speed of light changes when it goes from one medium to another medium?

We know, magnetic field=permeability/4π)Idlsin(theta)/r^2=>B changes according to permeabilityElectric field=1/permitivity*4π)*q/r^2E changes according to permitivitySince different medium have different permitivity and permeability v=E/B velocity of light changes in various mediums.

###### What's the property of light that doesn't change when it travels from one medium to another medium?

Hmmm... I might get balled out for this, but.....The 4 ‘properties' of ‘light' (photons), are . . . .Velocity, Amplitude, Frequency and Wavelength . SO....‘Velocity' can/does change, through different ‘mediums', whichdepends on the ‘mediums' refractive index.‘Amplitude' can change, relative to attenuation due to the degreeof transparency of the ‘medium'.During ‘transmission'

###### How many times would I go around the Earth in a year at the speed of light?

7.5 times a second, times 60 seconds a minute, times 60 minutes an hour, times 24 hours a day, times 365,25 days a year.236 682 000 times.

###### Would a spaceship traveling the speed of light look like a beam of light?

Nothing with mass can ever travel at the speed of light but a spaceship can travel very close to it 0.999c is perfectly possible. At 0.999c, no it will not look like a beam, it will look like a flattened spaceship. Its width and height will be normal but its length will be shrinked over 22 times.

###### What would happen if a black hole traveled faster than the speed of light?

The speed of light is the limit and the very first thing Wrong With Contemporary Black Holes. Quantum Relativity argues a case for quantum black holes that strongly interact. You still have a singularity defined by the Schwarzschild, but the Reimannian

###### How much time will pass on Earth if I travel one year in space with speed of light and return?

Two years.This is the answer if the question you ask is:If I travel at light speed away from the Earth while a year passes on Earth, and again at light speed back towards Earth while a year passes on Earth, how much time will

###### How viable is the idea of designing a spaceship for global faster-than-light travel by manipulating local space around the spaceship to make distance traveled locally shorter?

This is Alcubierre's idea, and it doesn't work, because there is an energy condition on matter which cannot be realistically violated which guarantees that you can't outrun light locally. It is the same condition that makes it that black holes

###### What is faster, the speed of light or the speed of darkness?

The speed of dark was proven to be greater than the speed of light by the troll mathematical physicist Big Al Onestone.His Theory of Special, General and Totally Indiscriminate Relativism states that if the speed of light were 600mph, the speed of dark would be at least 601mph. Otherwise, it wouldn't be able to get

###### Why would it be impossible to travel at the speed of light through a vacuum, I mean, it's not like there is any friction stopping the craft, so why would infinite fuel be needed?

Because the answer is.....drum roll please... the universe is way it is...Thats the answer. Friction isnt the cause of your blockade to speed of light. It is the universe itself. Or i should say space-time fabric itself.Our existence is defined according to our interaction with space ans time. At rest we dont travel through space but we travel

###### If, at the speed of light time stops, how do photons have motion that is measurable?

Different frames of reference.Time stops in the frame of reference of a photon - a massless particle travelling at the speed of light (as seen by other massive observers.)For observers that have mass, the photon is travelling at the speed of light - although the observervers will experience that photon to have different wavelengths (or energy).

###### Can this come close to the speed of light?

If that is what you wish to do, why are you stacking up 1 million escalators ?After all, the topmost escalator moves at 10^9 Km/h and the machine that is running this escalator will supply the whole power i.e. F*10^9 Watts. So first of all, there is no use of stacking up the

###### Will a vacuum affect how the speed of light travels?

Light can change speed, even in a vacuum, a new paper reports. The discovery could change the way we think about one of the constants of the universe.

###### What is the fundamental reason of the speed of light being constant in all frames of reference?

The most simple answer to this might not be very satisfactory, but as I see it this is one of these question with the answer

###### What does light look like if you could travel almost as fast as light?

The theory of special relativity teaches us that no matter how fast you think you are going, you will always measure the speed of light to be roughly 3 /times 10^8 m/s. In other words, you can never gain speed on a photon. This weirdness is part and parcel of special relativity. The difficulties in conceptualizing

###### Does the speed of a photon equal c or 0 when observed by another photon moving on a parallel trajectory?

Much of what we have today in the form of viable, testable, reliable theories of various aspects of physical reality began as a thought experiment. The notion that a photon has a point of view, or can

###### Does time stop if we go at a speed greater than speed of light?

the answer is no , time doesn't stop if we go at a speed greater than speed of light? time gets slower but it doesn't stop \$\$\$\$\$\$ because of the greater pull towards the black hole we feel more gravity and hence the time gets slower tera 10 RAISE TO 12 second by second and

###### How slowly can light travel?

Humans have managed to slow light down to 38 mph for a few seconds. Before you say that messes with relativity it does not because the light was not in a vacuum. The speed of light is only constant in a vacuum. Physicists Slow Speed of Light Some people have

###### Is thought faster than light?

It is sometimes objected that "they said no-one would ever go faster than sound and they were wrong. Now they say no-one will ever go faster than light. . ." Actually it is probably not true that anybody said it was impossible to go faster than sound. It was known

###### Which is correct, "When passing through air, green light travels faster than violet light" or "When passing through glass, red light travels slower than violet light"?

Neither.Light travels at the same speed - approx. 3 x (10 to the power of 8) meters per second, irrespective of the frequency. In fact, the Speed of Light ‘C' is the constant of proportion in the relation between Frequency and Wavelength - which are inversely proportional to each other.[math]Wavelength =

###### How long would it take to travel 100 light-years with our technology?

Using one of the fastest space crafts ever developed, the Voyager 1 space probe, it would take roughly 1,736,809 years to travel 100 light years, travelling at its maximum velocity of 62,140 kph.Hope this helps.

###### Did the early universe expand faster than the speed of light? If nothing can travel faster than the speed of light, is it possible that the speed of light was much faster than it is today?

Expansion rate is not measured in [m/s], but in [1/s], so you cannot compare expansion rate to speed of light/anything. It's like comparing kilograms and seconds.Two points at rest that are a distance D apart will see that distance grow in an expanding universe. D will increase in [m/s]

###### How long does it take a message to reach Earth if you are 7 light years away in space?

Radio waves and lasers are part of the electromagnetic spectrum, and travel at the speed of light (in a vacuum). A light year is a measure of distance, how far light can travel in a year.So if you are seven light years

###### Why does light have no mass?

The question should be, why doesn't everybody understand what mass is. Mass is not a physical thing, it is a property of things. Not only does matter have mass, but so do units such as potential, resistance, magnetic flux, and angular momentum.The next problem with this question is that light

###### While travelling near the speed of light and I shine a light forward, what speed is that light travelling?

OK, first if you are traveling at the speed of light, you ARE a photon, so you ARE your own flashlight, and yes, your light (yourself) will travel forward at c.Here's the cool equation: consider you're on a ship moving at velocity u (relative to an observer),

###### If light did not travel in a straight line, how would it affect our vision?

Light is dual in nature, a wave or/and particle. So this affects the way light travels. To keep my answer short, here are few examples where light rays donot travel straight:Scattering phenomenon: Light rays from the sun are scattered before it enters the eye because of which the ray

###### If a light source is travelling at the speed of light, does it emit light?

The answer to your question is a simple yes it does. An observer will observe the emitted light and would MEASURE its speed as

###### If nothing is impossible, can we move faster than light?

We know that the statement "nothing is impossible" is false.It is impossible to know both the position and momentum of a particle within a certain limit. If you precisely know the momentum of a particle it is impossible to know the position of the particle within

###### How long would it take to travel across the Milky Way at the speed of light?

It depends on who you're asking.If you want an answer to this, you typically start out with a Minowsky Diagram. It's relatively easy to construct-two perpendicular lines with the vertical labelled ct for timexlightspeed and horizontal labelled x, like in a graph, and you're almost done. For convenience's  sake we'll measure distance, x, in light seconds-

###### Does the speed of light slow down while it passes by the black hole?

Yes. The Shapiro delay, which is a measurement of an extended round trip, is a classic experiment confirming General Relativity:

###### Does lightning go as fast as light or sound?

Lightning is rather a sequence and a series of events rather than a single thing. It is light and sound. Each travels through a different medium and at different speeds. The lightning has a cause for creation, and another cause for the path of discharge, and yet another for the humongous discharge.The electric fields are first created

###### How do we know we are not travelling close to light speed in relative to something outside the observable universe and therefore to us, the aliens can observe but never reach us?

A simple answer to a difficult question.We are already moving very close to the speed of light relative to things very very far away.The observeable universe has a 15 billion light year radius with us at the centte.Everywhere in the universe is

###### If the universe is expanding with a speed equal to double of speed of light, cant we say that we are traveling faster than speed of light?

The question assumes a rather precise rate of expansion: twice the speed of light. But c is a speed (meters per second) whereas space doesnt expand at a speed. Space expands a certain amount of distance PER distance PER unit of time. A car goes

###### Is there any method of faster-than-light travel that doesn't allow time travel?

i think that you should try to answer another question before that: is the speed of light the biggest speed we know? and why is the biggest. the answer is very close-related to mass...take as an example the neutrinos ( neutrinos are mass-less particles ) aaand there was an experiment conducted that

###### A bulb is traveling at the speed of light and it is glowing. Will the light ray going forward go twice the speed of light?

Light ray can not travel faster than its own speed because we can't give the inertia to the light and the rest mass of photon is also zero. It is the reason due to which light can't be move faster than its own speed

###### How will time be affected if someone travels at a speed exceeding the speed of light?

It is not possible in both theoretical and practical physics that govern this universe. Because to travel the speed of light only we require infinite amount of energy which is not possible and anything with mass it is not possible. At the speed of

###### How far does light travel in 1 second?

The speed of light is one foot per nanosecond. Therefore, in one second, light travels one billion feet!

###### Is it possible to increase or decrease the speed of light?

In my opinions, all photons are surfing/carried on a kind of wave. (Sourced from expansion of universe) Speed of these waves are "C". These waves are affected from energy density of crossed environment. Ie, intense magnetic or gravity waves

If you mean

###### What object can move at the speed of light?

An alternative view; Entire space, outside basic 3D matter-particles, is filled with an all-encompassing universal medium, structured by quanta of matter. Universal medium creates, sustains and moves the most basic 3D matter-particles, the corpuscles of radiation - the photons. Photons are moved by universal medium at the highest possible (hence critical constant) linear speed, the speed of

###### How many human years will it take for light to reach the Earth from the farthest observable star?

Light will take 4 years, 3 months and 18 days to reach the Earth from the nearest star Proxima Centauri. However, from the farthest observable star, light would take around 1500 years to reach the Earth.And, if you want to travel atleast up to the nearest star Proxima Centauri it might take around

###### Could the matter on the surface of a fast spinning star travel faster than light?

No. There is a universal space-time constant that happens to equate to the velocity of a massless object in space: c. To approach any velocity, objects having mass need to be accelerated using mass as a propulsive; an object having

###### Can information one day travel faster than light?

If two spheres of mass M1 and M2 are the only objects in space. With M1>>M2. The distance between M1 and M2 is extremely large. M2 will revolve around M1. If the mass of M1 is made to increase and reduce at random in accordance to a coded message. The path

###### Is the speed of light infinite?

No, it is not.Infinity is not a number. We use it to define a quantity which is bigger than any number.The speed of light is approximately 3E8 meters per second.How to find it? According to the classical physics light is an electromagnetic wave. So, it

###### Given that the speed of light is a fundamental constant, why do we not rely more on this assumption when talking about how the universe expands?

Contrary to what this question suggests, the existence of an invariant speed (aka. the vacuum speed of light) is a fundamental principle of relativity theory. Relativity theory, in turn, is the basic underlying theory behind our modern ideas of physical cosmology.

###### How long would it take a spaceship traveling at 2.5x the speed of light to travel from Earth to the edge of the universe?

Disregarding the fact that it is impossible, the radius of the observable universe is roughly 50 billion light years. As seen from earth i twould take around 20 billion years to reach the end of the currently observable universe.Although after 20 billion years the radius of observable universe as seen from earth would have increased by 20 billion light