64 Chapter 2
3. The slowing of time mutuay aects each party equay
On the other hand...what
do you think it wi lk
like when I lk at the
space station's light
clock while riding by in
the rocket?
What...wi
that be...
Ha ha!
It wi
aear
to be at
rest!
Shouldn't the
paage of time on
the rocket...
...be faster as
observed by those
on the rocket as
we?
It's
t-t
fast!
Did you forget
If you consider the
principle of relativity,
it's not related to which
one is at rest and which
one is moving!
Tha-that's what
I thought you
said...
S l o w
Zip!
KO
RELATIVITY_03.indb 64 3/15/2011 3:26:42 PM
What Do You Mean, Time Slows Down? 65
It's because when observed
from the rocket, the space
station paed by at near
light spd.
Mhm...and the light
traveled along an angle
for the space station's
light clock when viewed by
MiUraga...
In other words, the
space station's time was
the one that slowed
down, wasn't it?
Sti has
not aived
Aived!
That's
right!
this analysis suests that the
observer on the space ship
and the observer on the space
station wi both think that
the other observer's clock is
moving slower than their own.
from my point
of view, you're
moving away
from me!
Zm!
RELATIVITY_03.indb 65 3/15/2011 3:26:43 PM
66 Chapter 2
Huh?
Just wait a second!
...what was that?
What's the
maer?
When observed from the space station, the rocket is moving.
Caot distinguish aording to relativity
When observed from the rocket, the space station is moving.
This means the
Urashima eect does
not our, doesn't it?!
It's a lie! It's a fraud!!
when the observer on the space
station and the observer on
the rocket ship mt after the
rocket ship returns, both of
them can't think that the other
person has aged slower.
one of them must be right
and the other wrong.
Fraud?!
That's right!
It's strange, isn't it?!
RELATIVITY_03.indb 66 3/15/2011 3:26:44 PM
What Do You Mean, Time Slows Down? 67
This is the famous
thought experiment
known as the twin
Twin...?
Twins
For example, aume
there are twin sisters,
and the younger sister
(by a few minutes)
remains on Earth...
while the older
sister travels
through space at
near–light spd.
Bring
me a
souvenir!
Be
careful,
OK?
Don't
woy
Aording to the
special theory of
relativity, time flows
more slowly for the
older sister who moves
at near-light spd...
and when she
returns to Earth,
the younger sister
has become older.
I'm back!
I brought you Venusian
caed crab and also
a space bear wd
carving.
Wow...You've
reay grown up,
haven't you?
My dear older
sister...you've
stayed so
young!
Do you have
anything else?
those souvenirs
sound awful!
This is the
Urashima eect,
right?
Older
sister
Younger
sister
RELATIVITY_03.indb 67 3/15/2011 3:26:45 PM
68 Chapter 2
But from the older sister's
standpoint, Earth, where the
younger sister is, sms to
move away at near–light spd.
the younger sister's time slows
down. there sms to be a
I s what
you're saying...
The younger
sister claims, "My
older sister's
time slows down"
since the rocket
is moving.
Both of them mutuay
claim that the other
twin's "time slows down."
Aording to the theory,
time slows down for
the older sister, who
and when she returns to
Earth, the younger sister
wi be older.
The older sister
claims, "My younger
sister's time slows
down" since Earth
ismoving.
this crab is
unexpectedly
delicious.
It sure is,
isn't it?
Can I
have
some?
RELATIVITY_03.indb 68 3/15/2011 3:26:46 PM

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