# Faster than light morse code v2 [duplicate]

Imagine a theoretical superhard steel cylinder pointed towards the moon , 1 cm in radius and 380,000 km long, traveling at 1km per hour towards the moon. Parallel to this cylinder, 1 meter away we have a magnetic cylinder of equal dimensions, not moving. If we pushed the magnetic cylinder "down" towards the moving steel cylinder, causing the steel cylinder to stop, would both the earth side and the moon side stop at the same time?

Would this pulse be a faster than light morse code machine?

• A key question for this is how did you push the magnetic cylinder? You'll find that distortion is a big deal along the length of 380,000km. It won't just move sideways as a rigid body. Thus, how you made it move sufficiently rigid to accomplish your goal will have a great effect on how far signals had to travel. Mar 1 at 19:00
• we are in the future. we have 3000 mini space ships pre-synchronized to push the magnetic rigidly cylinder down. concept of faster than message. the cylinders could be a rigid ring around the sun. Mar 1 at 19:25
• Possible duplicate by OP: physics.stackexchange.com/q/617851/2451 Mar 1 at 19:52