- #1
Thecla
- 132
- 10
In Lee Smolins book Time Reborn he discusses simultaneous events and says events that
are far from each other we find that there is no absolute ordering that all observers can agree on. For some observers the two events may be simultaneous for other observers one event may be in the past of the other.
Also earlier in the book he says that observers do agree about what can be called the causal structure. Take 2 events x,y.There are 3 pssibilities
x could be the cause of y
y could be the cause of x
neither could be the cause of each other.
Does the second paragraph contradict the first?
I will describe a scene where two events are far from each other:
A rocket ship takes off from Earth and 4 months later it lands on Mars.
Are there some observers who see the take-off and landing as simultaneous?
Are there some observers who see the landing on Mars before the take-off from earth?
are far from each other we find that there is no absolute ordering that all observers can agree on. For some observers the two events may be simultaneous for other observers one event may be in the past of the other.
Also earlier in the book he says that observers do agree about what can be called the causal structure. Take 2 events x,y.There are 3 pssibilities
x could be the cause of y
y could be the cause of x
neither could be the cause of each other.
Does the second paragraph contradict the first?
I will describe a scene where two events are far from each other:
A rocket ship takes off from Earth and 4 months later it lands on Mars.
Are there some observers who see the take-off and landing as simultaneous?
Are there some observers who see the landing on Mars before the take-off from earth?