How big is the Universe?
Is the Universe infinite? The distance from the "end" of the observable universe,
is 46 billion light years,
but that does not mean that it ends there,
since it is constantly expanding.

What existed before the Big Bang?
So far, scientists can not imagine, what was in the universe before the Big Bang,
even if there was a Universe!


What will be the end of the Universe?
Theorists believe that the Universe began with the Big Bang,
but there are still many doubts as to how it will end.
It is not possible to know,
if the Universe will continue to expand to the point of disintegration of all matter,
the Big Rip, or if the expansion will cease, and the spatial plane go into condensation,
the so-called Big Crunch.

We are alone?
The question that does not want to shut up:
are we alone in the Universe?
in the 1960s,
astrophysicist Frank Drake posited a controversial equation suggesting that,
taking into account several factors,
the probability of life elsewhere is extremely high.
Drake counted the formation of new stars, the number of stars with planets,
the combination of conditions for the existence of life,
among other specifications.
We have not yet found life in any corner of the galaxy,
but that does not mean we should lose hope.


Parallel universes?
We may not be alone and may not be unique.
The theory of physical researchers,
is that we can be in a multiverse,
with other parallel universes.
Speculation suggests thinking of our universe as a bubble,
like a snow globe,
and what other alternate universes exist within its own bubbles.
Despite being a concept very close to the classics of science fiction,
astronomers look for evidence that indicates points of collision between the universes.


What is dark matter?
In the cosmological model accepted by the scientific community,
the Universe is composed of energies and particles that interfere in the gravity,
expansion and acceleration of the space.
It is believed that 73% of the density is constituted of dark energy,
which would have the effect of negative pressure on the Universe,
and 23% of dark matter,
which hypothetically has gravitational effects on visible matter.
Because it is completely invisible to telescopes,
and because it does not emit light or electromagnetic radiation,
dark matter is extremely difficult to study.
Scientists speculate that,
it is made up of subatomic particles different from those of visible matter,
but its gravitational effect is noticeable in the movements of galaxies, and stars.
One of the main features, for the study of dark matter is the design (Alpha Magnetic Spectrometer),
on the International Space Station,
which collects data on the flow of cosmic rays into Earth orbit.