>3000 years for 100 ly, allowing for acceleration and deceleration. The aliens would be fanatics to still be interested after that time. Have you taken into ac

>3000 years for 100 ly, allowing for acceleration and deceleration. The aliens would be fanatics to still be interested after that time. Have you taken into account the relativity of time? If i've understood it correctly, time stops at the speed of light. For an alien travelling at that velocity, moving from one end of the universe to the other will take no time at all! No fanaticism required. How will they have time to stop? Also, does anyone know if an object with mass even move at the speed of light?