180 Chapter 3 The Universe Was Born With a Big Bang
Do Aliens Exist?
In Chapter 4, we will discuss more about what it’s like at the edge of the universe. But first,
let’s consider one common question about the universe: Do aliens exist?
We’ll tell you the conclusion first. Most
scientists who study the universe believe
that other sentient beings like humans exist
somewhere. This conclusion is based on the
Cosmological Principle.
The Cosmological Principle is the hypoth-
esis that the universe is homogeneous (the
same kind) and isotropic (the same from any
direction) on large scales. What that means is if
you take a big chunk of universe, and c ...
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