Two observers in relative motion will agree that two events are simultaneous:
1. Never since they are both moving
2. Always only if they occur at the same time
25% 25% 25% 25%
3. Always only if they occur at the same place and time
4. Simultaneity is impossible
0 of 250 in Relativity
N ev er
s in ce
th ey
a re
...
A lw ay s on ly
if
th ey
o
...
lw ay
A
o
...
s on ly
if
th ey
S im ul ta ne ity
is
im po s.
..
30

In the scene below, Ryan sees the two firecrackers explode at the same time. What does Peggy see in her frame?
1. Firecrackers explode at the same time
2. L before R
3. R before L
33% 33% 33%
L peggy R v
0 of 250 ryan
F ir ec ra ck er s ex pl od e a.
..
L
b ef or e
R
R
b ef or e
L
10

In the scene below, Peggy sees the two firecrackers explode at the same time. What does
Ryan see in her frame?
1. Firecrackers explode at the same time
2. L before R
3. R before L
33% 33% 33%
L peggy R v
0 of 250 ryan
F ir ec ra ck er s ex pl od e a.
..
L
b ef or e
R
R
b ef or e
L
10

Human lifetimes are usually less than 100 years, and nothing can travel faster than light. Is it possible for a human to survive a journey of 200 light years?
1. No way!
33% 33% 33%
2. Yes way!
3. Possible only with a wormhole
0 of 250
N o w ay
!
Y es
w ay
!
P os si bl e on ly
w ith
a
...
30