What really is the speed of light?

best trolling ever. I can't believe these people even bothered to answer.

You, Sir, are a genius!

Speed of Light has no relation with size of the source.

When you see a light coming from sun, then it is the light which is 8 min older.

As the speed of the light is 299,792,458m/s and the distance between sun and earth is 149,598,000 km. So we cannot see the difference of 8 min as the source is constantly sending light to Earth.

Imagine that a sun emits light at 5:52 AM and the earth comes in front of the sun at 6:00 AM.

So when a earth comes in contact with the sun, the light emitted by the sun at 5:52 AM reaches the earth at 6:00. This happens constantly.

Another example is of the scientist working at NASA. When they observe some pictures then this pictures are also old. Some of these pictures are those of the remains of the Big Bang.

The picture of engulfing of Sun by a Black Hole reaches the telescope far later as it takes time for light to travel such long distance.

No, considering the distances involved are hugely different and that you can't react quickly enough to notice a 'speed' of light. Can you accurately and precisely measure the time taken for the light photons to travel from one point to another? No, this can only be done with highly precise and expensive equipment found in research laboratories. (Or using telescope and positions of planets but this is much less precise). The light that we see is actually millions of years old since it takes that long for light emitted from fusion in the Sun's core to reach the outside. However it takes 8 minutes to reach the Earth once it has left the Sun's surface.

The speed of light is a fundamental constant in Physics and is equal to

299 792 458 m / s. This stays the same everywhere according to Special Relativity no matter how quickly something is already traveling. So no, the speed of light doesn't vary with the light source.

The speed of light has nothing to do with the sizes of objects but distance only. The fact is, even when you do your experiment in your room the scales stand the same, it does take time for light to travel from the flashlight to the sun model, it's just that the distance is too short for light that you can't identify how many billionths of a second it took to travel that distance, but the distance from sun to earth is enough for you to realize how much time it took, the distance between the sun and earth is about 90 million miles

"isn't it obvious that it takes no time for the light of that lamp to hit the sun" - no, its not obvious.

If light takes 8.3 minutes to travel the distance between the sun and the Earth, why would it matter which direction it was moving - it would still take 8.3 minutes.

Your idea of a model doesn't work, because the distance between the objects in your model are so small that light appears to travel that tiny distance instantaneously.

The ratio of distances doesn't matter, any model that is small enough to set up on Earth (even on a football field for example) is still such a small distance that the time for the light to travel is too short for you to measure.

Its a real shame they don't teach any basic science in schools anymore...

The speed of light is 299,792,458 metres per second, or approximately 186,282 miles per second. You're used to light being seen as instantaneous because you're entire life you've experienced it on a tiny scale. (Turning on a flashlight). It's like if you shot a bullet at something five feet away. It'd appear to arrive at the target instantly. However, if you were to shoot at something very far away, you would realize the time it takes for the bullet to travel. Keep in mind the earth is about 150 million km from the sun.