If you want to see farther into the distant Universe, you need to gather more light. Just as a light bulb or candle appears fainter the farther away it is from you, the stars and galaxies located at progressively greater and greater distances are much more difficult to detect and observe. In astronomy, your ability to find and study an object is completely dependent on how many photons you can collect from it.

from Forbes – Tech http://ift.tt/1k4PbeQ
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