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How Do We Know How Old is Our Sun?

The Sun is the closest star to Earth, the power-source for all life and the primary constant humanity has ever known. We know that the sun rises in the east and sets in the west, and has done so since the dawn of time. This huge ball of gas (109 times bigger than our planet) is truly remarkable, but is it going to be there forever? And besides, how old is our Sun anyway?

 
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Related Topics: Video, Science, Stars, Sun, Astronomy
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