system
Given the following post, respond as if you're commenting on Reddit:
human
Could you Skype at Relativistic Velocities?

If I'm on a ship traveling at relativistic velocities and I attempt to Skype with someone back on Earth (assuming Wi-Fi reached that far and the receivers were tuned to account for the red/blueshift), what would it look like to the people on either end?  If they could connect, would either one be able to notice the time dilation?
gpt
As long as the ship is traveling at velocities below the speed of light (c), communication is possible.

But as the velocity increases, all communication signals get shifted towards longer wavelengths. This means that the "bandwidth" of the signal decreases, and you can't pass as much information through it as before. It's like having an internet connection that gets slower and slower.

At the speed of light, communication with the ship flying away from you is obviously impossible, and the bandwidth becomes zero.

Both parties will observe that the time on the other end runs more slowly.This will be independent of whether they are moving towards each other or away from each other, or even past each other.

However, there will also be a Doppler effect on top of it that will slow the stream down when the ship is flying away, and will speed things up when it is flying towards the Earth. You can only calculate time dilation after you make corrections for the Doppler effect.

Also, as the ship gets further and further away, there will be large delays between the time you say something and the time you hear their response. Even trying to talk to someone on the Moon is hard, because you need to wait for two seconds to hear back from them.