It is not easy to know which is the brightest
star in the universe, because all depends on where
that star is located if we look at it from Earth.
In our sky, the brightest star is Sirius.
It is sometimes called the Dog Star and it always
flickers with many colors.
If we want to think about "the brightest star
in the universe", scientists need to know the
location of the stars, because they might not look
very brilliant to us, but it is because they are
very far from Earth. Suppose we could put all
stars at the same distance from Earth, then
which one would be the brightest?
Well, we don't know which star truly is the
brightest, but we know that some of the stars are
remarkably bright. For instance, there is one
called Deneb. This star forms part of the
three stars on the group called the
Summer Triangle. Deneb is farther from
Earth that other stars that we can see, and it is
around 100,000 times brighter than the Sun.
You can "click" on the links that you see in
this answer, and find out pictures and more
information about "Sirius" and "brightest stars".
I'm not sure we know what the brightest star in
the entire universe is, because whether we can see
the entire universe clearly is still a subject
under research. The brightest star to us on
Earth is of course the sun, because we're
closest to it. If we rate stars based on actual
measurements of brightness that also considers
distance from the Earth - because naturally
the farther away the star is, the dimmer it
will look to us even if it is very bright, so
we have to put the distance from Earth into the
measurements, too, to "correct" for what looks dim
to us - then the brightest star we can measure
right now is called Sirius, and it's in the
Canis Major ("Greater Dog") constellation.
Hope this helps.
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