To communicate with such a civilization it would take 100 years to send a message and another 100 years to get an answer (not counting the time it takes them to think of an answer)
You can use Morse code. The Navy uses Signal Lamps, which are lamps that produce concentrated, focused pulses of light. But you could just use a flashlight, depending on what you were communicating and the the circumstances of your predicament.
300000 years at or 600 years at the speed of light in our fastest spacecrafts which travels 157,078 mph.
Electromagnetic radiation is the fastest known information carrier, and according to relativity and modern physics, it's the fastest possible. The term 'electromagnetic radiation' includes AM and FM radio, TV, microwave radio, microwave cooking rays, heat, visible light, ultraviolet, X-rays, and several others. All of these are the same physical phenomenon; they differ only in wavelength (frequency), and they all travel at the "speed of light" ... about 300 million km (186 thousand miles) per second.
Well, light does it in about 3 seconds, the ships that humans have built so far take about 3 days each way.
At 99.999999999999999999999999% of the speed of light, just like everything else that has mass. But also take in account acceleration, safely the fastest speed to accelerate is a constant 2g acceleration without killing your astronaunts.
the fastest form of energy is light
light is the fastest
no light is the fastest on earth
Light is however the most fastest thing. But it has been concluded that it travells the fastest in vacuum.
The fastest speed of light is in a vacuum place because nothing interrupt its motion.
Tachyon is the fastest thing ever because its slowest velocity is the speed of light! Light is the fastest thing that can be seen.
no contest, light wins.
The speed of light is fastest in a vacuum. All other media slow the speed of light down, albeit very slightly.
Tachyons are theorised to be the fastest particle in the universe their slowest speed being the speed of light. But until they are proven to exist, light is the fastest thing in the universe.
speed of light
When the light is traveling through vacuum.