A perfectly rigid tube is one light year long. A laser is mounted at the near end of the tube . The tube is rotated I revolution in 8 minutes, and the laser is turned on at the same time.
The light will have travelled 93,000,000 miles, while the tube has rotated 1 light year at the opposite end, in 8 minutes.
A perfectly rigid tube is one light year long. A laser is mounted at the near end of the tube . The tube is rotated I revolution in 8 minutes, and the laser is turned on at the same time.
The light will have travelled 93,000,000 miles, while the tube has rotated 1 light year at the opposite end, in 8 minutes.
Light is slow.