64 Chapter 2
3. The slowing of time mutuay aects each party equay
On the other hand...what
do you think it wi lk
like when I lk at the
space station's light
clock while riding by in
the rocket?
What...wi
that be...
Ha ha!
It wi
aear
to be at
rest!
Shouldn't the
paage of time on
the rocket...
...be faster as
observed by those
on the rocket as
we?
It's
t-t
fast!
Did you forget
already?
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 paed by at near–
light spd.
Mhm...and the light
traveled along an angle
for the space station's
light clock when viewed by
MiUraga...
In other words, the
space station's time was
the one that slowed
down, wasn't it?
Sti has
not aived
Aived!
That's
right!
this analysis suests 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!
Zm!
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.
Caot distinguish aording to relativity
When observed from the rocket, the space station is moving.
This means the
Urashima eect does
not our, 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
paradox.
Twin...?
Twins
For example, aume
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 spd.
Bring
me a
souvenir!
Be
careful,
OK?
Don't
woy
about me!
Aording to the
special theory of
relativity, time flows
more slowly for the
older sister who moves
at near-light spd...
and when she
returns to Earth,
the younger sister
has become older.
I'm back!
I brought you Venusian
caed crab and also
a space bear wd
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 eect,
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, sms to
move away at near–light spd.
the younger sister's time slows
down. there sms to be a
contradiction.
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 mutuay
claim that the other
twin's "time slows down."
This is a paradox.
Aording to the theory,
time slows down for
the older sister, who
had rien in the rocket,
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
ismoving.
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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