The life cycle of a star depends on its mass, and as a result stars with soaring mass are brilliant than those with fewer mass and rage rapidly all the way through their hydrogen fuel supply. For example, a star twice as large as the sun which has enough fuel to burn up at its core at its present intensity for roughly 9 billion years, can burn through its reserves for about 800 million years. A star that is half the size of the sun burns slowly through its reserves and can take 20 billion years to burn out completely. Scientists can calculate roughly how old stars maybe by observing their globular clusters. These are solid collections of around 1 million stars formed at the same time and they produce much softer light as compared to the sun (NASA Goddard space flight center 2010).
These two scenarios form the basis of how the universeâ€™s age can be measured and estimated to a close enough figure. Stars within a cluster form a cosmic clock as their formation takes place at just about similar periods, while stars within the most matured globular clusters have stars less than 0.7 solar masses. Therefore some of the old globular clusters can be estimated to be about 11-18 billion years. 10 million-year-old cluster hydrogen stars have approximately 10 solar masses in size.
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