- #1
lowemack
- 12
- 0
Please help me to understand.
In theory with a powerfull enough ship a space man can travel to a distant star, say Proxima Centura (4.2LY away) in 2.1LY by his own clock, yet on Earth and Proxima Centura more than 4.2 years will have passed.
My question is why will he not measure Proxima Centura coming towards him at twice the speed of light?
Surely speed is distance over time and in his reference frame he as traveled at twice the speed of light.
In theory with a powerfull enough ship a space man can travel to a distant star, say Proxima Centura (4.2LY away) in 2.1LY by his own clock, yet on Earth and Proxima Centura more than 4.2 years will have passed.
My question is why will he not measure Proxima Centura coming towards him at twice the speed of light?
Surely speed is distance over time and in his reference frame he as traveled at twice the speed of light.