What is the fastest thing in the universe?

speed of light Laser beams travel at the speed of light, more than 670 million miles per hour, making them the fastest thing in the universe.

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Are bullets faster than sound?

When bullets fly through the air, they do so at amazing speeds. The fastest bullets travel more than 2,600 feet per second. That's equivalent to over 1,800 miles per hour. To put that in perspective, it's amazing to realize that bullets travel over twice the speed of sound! How fast is a tachyon? One of the most intriguing entities in relativity theory are tachyons. They are hypothetical particles that travel faster than light. They are distinguished from "bradyons," particles that travel at less than the speed of light.

And another question, do shadows exist in darkness?

If you are in absolute darkness, such as in a cave with no lights on, there aren't any shadows. If, instead, there is dim light, places the light doesn't reach will be in shadow. What medium slows down light the most? Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3) and 200,000 kilometers per second in glass (refractive index of 1.5). Speed of light is the lowest in diamonds.

Keeping this in consideration, how fast can a human go without dying?

This is a well documented field, and the average maximum survivable g-force is about 16g (157m/s) sustained for 1 minute. However this limit depends on the individual, whether the acceleration is applied to one's entire body or just individual parts and the time in which the acceleration is endured over. One may also ask how long would it take to travel to the nearest star at the speed of light? Travel Time If Voyager were to travel to Proxima Centauri, at this rate, it would take over 73,000 years to arrive. If we could travel at the speed of light, an impossibility due to Special Relativity, it would still take 4.22 years to arrive!