The Closest Earthlike Planet 203
The Closest Earthlike Planet
By the way,
...why did you
chse this
I'm not the
one who wants
to know the
It’s people like
you who want to
know, isn't it?
I gue
it is!
Buckle up!
204 Chapter 4 What Is It Like at the Edge of the Universe?
The spaceship
Kaguya-go left
Earth and shot o
toward the edge
of the universe
without even casting
a glance toward
Before long,
it paed Mars,
Jupiter, and Saturn,
and then it left the
solar system.
We’ve gone
ro ughly
four light-
the only one who
lks like you’ve
goen older...
It's because
I was a lot
older than you
to begin with!
Excuse me, but
cant you go
any faster?
Are you
We can’t go faster than the
spd of light! Havent you
ever heard of Einstein’s
Theory of Relativity?
The Closest Earthlike Planet 205
What are those
thr stars?
That's Alpha
Centauri, isn't
it? They are the
closest stars to
the solar system.
It's a triple-star
system, and some
scholars believe that
it contains planets on
which living creatures
may exist.
That may be
A place with thr
suns would be awful!
Calm down!
It would be impoible to
protect yourself from
ultraviolet rays!!
We have to kp
The Kaguya-go Journey
Board Game
Edge of
the universe?
Great Wall and Voids
Although galaxies form clusters and superclusters, when we
look at all of space as a whole, the galaxies are arranged in a
netlike pattern. In other words, many bubbles are collected
together—the surfaces of those bubbles are galaxies, and
the interiors of the bubbles are voids. Since the galaxies
seem to create a large wall when observed from Earth, this
kind of large-scale structure of the universe is called the
Great Wall.
Nowadays, the mesh formed by the Great
Wall and voids is said to be the largest
structure of the universe.
And the same kind of structure continues,
no matter how far we go, right?
Local Supercluster (Virgo Supercluster)
A supercluster is formed by an aggregation of clusters
or groups of galaxies and has a diameter of more than
100 million light-years. This is truly a cluster of super-
large heavenly bodies. The supercluster to which our
galactic system (that is, the Local Group) belongs is
called the Local Supercluster. It is also known as the
Virgo Supercluster.
Since the Local Group that contains
Earth is located toward the edge of
the Virgo Supercluster, it is approxi-
mately 60 million light-years to the
M87 galaxy in the Virgo constellation
near the center of the Virgo Super-
cluster. The diameter of the Virgo
Super cluster is said to be approxi-
mately 200 million light-years.
Local Group
Galaxies create aggregations called groups or clusters of
galaxies in space. The group of galaxies to which our galaxy
(the Milky Way) belongs is called the Local Group. This group
contains approximately 40 galaxies. The largest of these is
the Andromeda galaxy; the diameter of its disc is approxi-
mately 130,000 light-years.
According to scientists’ calculations,
the diameter of the Local Group is
2.4 to 3.6 Mpc (megaparsecs).
A parsec is the distance to a heavenly body
for which the annual parallax is 1 second.
If I remember correctly, 1 pc = 3.26 light-
years...therefore, the diameter is 7.8 to
11.7 million light-years!
Local Group
Local Supercluster
Great Wall and Voids

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