A supernova explosion on the far side of the Sun ejects a mass with approximately the same mass of the Sun directly at the back side of the Sun. If this ejected mass is travelling arbitrarily close to the speed of light, the advance warning of its approach would be arbitrarily close to zero. After it collides with the Sun, there would be a delay of just under 8 minutes before we would become aware of the sudden acceleration of the Sun towards the Earth.
Likewise, if a Sun spot suddenly appeared on the surface of the Sun, it would be approximately 8 minutes before we would would be aware of the Sun spot's appearance as observed from the Earth.
If person A on earth tugs a taught string held by person B located at the sun, would the tug be sensed immediately? (please ignore the obvious mechanical issues such as the earth being in motion, etc.).
