Preface
While I was writing the scenario for this book, a cameraman (whom I was working with on
an entirely different project) unexpectedly said to me, “Recently, I’ve been enjoying thinking
about the universe.”
I had no idea why he brought up the subject—it just popped up in the middle of an
ordinary conversation. When I asked him why he mentioned it, the cameraman said, “Well,
imagining what’s happening in the universe uses my brain in a completely different way
than my work does, so it’s really refreshing to think about.”
Of course! In our work, we’re constantly worrying about random details so that we
won’t make mistakes. Our minds get fatigued, just like how certain muscles ache if we do
a repetitive task for a long time. And just like how we can relieve muscle fatigue by doing
some light exercise, it’s always good to take a break from work to think about something
else for a while. A topic such as “What is happening in the universe?” fits the bill perfectly.
Since I also like thinking about the universe, I came up with a few pearls of wisdom to share
with the cameraman:
• “Since the entire universe is moving and space itself is expanding, theres no way to
indicate a specific place using coordinates.”
• “We still don’t seem to know what most of the matter and energy that make up the
galaxy consists of.”
• “There may be universes other than our own universe.”
Even though these thoughts are more like hints at mysteries than true knowledge, the
cameraman was intrigued, so the two of us batted around ideas for a little while. It was just
a short conversation, but I have extremely fond memories of it.
So why is the universe so interesting? Perhaps it’s because we may not arrive at any
answers, no matter how much we think about it.
Of course, mankind has compiled a great deal of knowledge about the universe so far.
The Big Bang theory, which sheds light on the secrets of the creation of matter as well as the
beginning of the universe, the discovery of the large-scale structure of space, and other
great discoveries have provided valuable answers in our quest for the full picture of the cos-
mos. However, whenever we gain new knowledge, we only seem to discover more mysteries.
The history of research about the universe is like climbing up a mountain to see what’s
beyond it, only to see another mountain, and then another, and another . . .
For example, consider the Moon. The question of whether there is water on the Moon
has been debated for quite a long time. If there is a large amount of water there, oxygen
could be created by decomposing it, and since it could also be used as drinking water, it

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