This is my first question. Hope it's in respect of quality standards.
Let's suppose to have a "long" rigid almost unbreakable bar of fixed negligible diameter . (we can imagine it as a rigid wire) Lets suppose that the "bar" goes from Earth to Sun (8 light minute distance) but not consider the masses/gravity of Sun and Earth.
1. If I pull the bar 1 meter , what's the relativistic analisys ? Since the info that "I pull the bar" travels at light speed , in the 8 minutes the info reach the Sun is the Bar one meter longer ?
2.The cosmological question: If the bar goes from one galaxy to another , how the universe expansion reflects on it?