Star trekking

22 May, 2011

COSMOS-AzTEC3 - a galactic city at the edge of the universe.
COSMOS-AzTEC3 - a galactic city at the edge of the universe.
Image: Japan's Subaru telescope, Mauna Kea Observatory, Hawaii.
Source: NASA/JPL-Caltech

Question: How long would it us take to travel around the area of the universe we can see from Earth?

Answer: We think the furthest part of the universe we can see from earth is 13 billion light years away (that’s the distance light would travel in 13 billion years). If you could travel around it in a super spaceship at the speed of light - 300,000 kilometres per second, the fastest speed known – then it would take 26 billion years for a round trip. BUT the universe may not be a closed system . If it is an open system, as you travel you might see more that we can’t see from Earth and so your journey could potentially never end!

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The Bludger 21 June, 2011 22:32
If we are at the centre of a sphere 13 billion light years in radius. Then a line around the sphere would mark out a circle 13 billion light years radius. The length of that line is 2 * pi* r. I.e. about 81 Billion Light years. If we traveled at the speed of light Newtonian Physics say that it would take 81 Billion Years.
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