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fishki.net Earth's Location in the Observable Universe от Helen за 23 oct 2012

Earth's Location in the Observable Universe от Helen за 23 oct 2012 (9 photo)

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The age of the universe is about 13.75 billion years. The diameter of the observable universe is estimated at about 28 billion parsecs (93 billion light-years). As a reminder, a light-year is a unit of length equal to just under 10 trillion kilometres (or about 6 trillion miles). The Observable Universe consists of the galaxies and other matter that we can, in principle, observe from Earth in the present day—because light (or other signals) from those objects has had time to reach the Earth since the beginning of the cosmological expansion.

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