A Century is 100 years so 8 Centuries is 800 years.
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If a century is 100 years, and you want to know how many are in 930, simply divide by 100. The answer is 9.3
Fifty centuries equal 500 years. This is because each century consists of 100 years. Therefore, 50 centuries x 100 years/century = 500 years.
There are 100 years in a century, so 10 centuries would be 1000 years.
It takes two hundred forty eight years
The statement means that it takes light eight years to travel from that star to Earth. In other words, the light we see from that star now actually emitted from it eight years ago.