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Showing posts with label measure. Show all posts
Showing posts with label measure. Show all posts

Monday, June 25, 2012

How do we measure the universe?


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?