There are 100 years in a century.
One century equals one hundred years.
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10,000 light years = 9.4605284 × 1016 kilometers.
There are 520 weeks in a decade. This can be calculated by multiplying 10 years in a decade by 52 weeks in a year.
period of revolution in Earth years for Mercury is 0.241 and Earth is 1.00. So 2.41 years in Mercury equalls 10 years in Earth. Correction : Using the above figures (which seem about right) : 10 years on Earth equals 10/0.241 years for Mercury. That's about 41.49 Mercury years.
The star 61 Cygni B is estimated to have a main sequence lifetime of approximately 10 billion years.
1.9 x 10^14 light years is equivalent to 1.9 quadrillion light years.