Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Ask Astro

Published: November 19, 2010
Galaxies-galore
Galaxies galore.
Photo by NASA/ESA/S. Beckwith (STScI)/HUDF Team
The total distance in light-years as measured today is therefore greater than the actual time of travel as measured by a stopwatch multiplied by the speed of light.

Using this logic and some equations, one can show that, given the universe’s age of 13.7 billion years, the most distant object we could possibly see in the universe today is about 47 billion light-years away.

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