[abhishekjha]

>Of that time, how long has life on Earth been generating signals that could be detected elsewhere?

Earth has a magnetic core and there are million things that generate EM radiation. Earth would have started radiating the moment it was created. It has a magnetic core as well. Now as per if somebody could read it 100000 light years away? Well the Sun was way hotter then and it would have obscured anybody looking this way.

Why aren't we seeing signs now, well maybe the signals are on their way but it may take another 20000 years to get them. I hope there is somebody here to receive and respond back.