The universe is very
large may be obvious, but sometimes it is worth remembering: the universe is
very big ... if you think about it and ponder for a moment, the truth is not so
obvious. Moreover, even really difficult to imagine how big it is.
Our usual measures are
wasted when we put them face to face with the immensity that surrounds us. And
one of the issues that most often appear when trying to measure the Universe is
the same: How? How do astronomers know a star or galaxy is 8,000 million light
years away?
The tools are different
depending on the distance that separates us from the object to be measured ...
from the parallax to help represent these cosmic beacons called Cepheids ,
astronomers make use of different methods to determine how many light years is
the object in question .
The Royal Greenwich
Observatory has released this video "Measuring the Universe" in which
he explains in a very simple, and it invites you to the exhibition on the theme
that remains open until September.
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