**Are we limited to parallel universes? Prepare to be mind blown by these four other prevailing multiverse theories.**

The theory
of parallel universes is not a new concept — the term multiverse has been used
as early as 1895. But what exactly is a
parallel universe? The theory of parallel universes states that many universes
exist parallel to each other within a large multiverse. Not all scientists
believe in these separate universes, but one cosmologist, Ranga-Ram Chany from
the California Institute of Technology, believes he may have captured the firstever glimpse of a parallel universe.

Chany used
data from the Planck telescope found at the European Space Agency, and
subtracted cosmic microwave background models from Planck’s picture of the
universe. What he found were regions
that were much brighter than they should be, almost 4,500 times brighter. This
finding is consistent with the idea that bumping parallel universes leave
behind a so-called “bruise” in the form of a ring of hot photons during a
collision.

Cosmic
microwave background research, analyses, and interpretation are extremely
difficult, and Chany admits that there is a 30 percent chance his findings are
just background noise or space dust. He
hopes to have more results in the next few years, but he likely won’t have
proof of his hypothesis until the next generation of space scanning technology
is complete in 15–20 years.

The
advancement of space scanning technology could also help prove the existence of
not only parallel universes, but other hypothesized forms of multiverses. How many other theories of multiverses could
there be?

**1. Infinite Universe**

An
infinite universe is one that is flat and stretches infinitely in space and
time. Since there is a finite number of
ways particles can be arranged in an infinite universe, eventually these
arrangements will repeat. This means
that if you were to venture out far enough, you would run into infinite
versions of yourself, some living the exact same life as you right now and
others that are completely different.

**2. Bubble Universe**

A bubbleuniverse is based on the idea that after the Big Bang, the universe expanded by
inflating like a balloon. The theory
suggests that some parts of the universe stop inflating while others continue,
resulting in bubble universes that may have completely different laws of
physics. According to the theory, our
universe has stopped inflating which is why we have stars and galaxies.

**3. Daughter Universe**

Daughteruniverses are hypothesized to be a product of outcomes or choices, meaning each
choice we make spawns a new universe.
For example, say you get acceptance letters for two different
universities A and B, our universe would then create daughter universes: one
where you go to university A, one where you go to university B, and one where
you do not go to either.

**4. Mathematical Universe**

Mathematicaluniverses are ones where mathematics is a physical reality, and the
mathematical structure that makes up our universe is not the only structure
that exists. Separate universes are
formed by different initial conditions, physical constants, and mathematical
equations.

Will the
proof of other universes continue to remain just beyond our grasp, or will we
one day find the key to unlock the door separating us from the secrets of the
cosmos?

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