Quote:
Originally Posted by Stitchawl
John has two sisters and two brothers. Three of the five children in the family have dark brown hair, one has red hair, and one has light brown hair. Around 40% of cats with white fur and blue eyes are deaf. Using no other information, calculate the declining mass of the sun and to the nearest million years, when it will reach Supernova.
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Since John and his family are part of a species that have evolved sufficiently to domesticate and breed cats that have such a significant defect from a survival point of view, they must live on a planet that has been around for about 4.5 billion years circling a G-type sun. It's well known that such suns lose mass at a rate of about 4 million tons per second.
To the nearest million years never is when the sun will reach Supernova, since clearly the Sun does not have sufficient mass to do so.
It will run out of hydrogen in about another 5.5 billion years, becoming a red giant. About 3.5 billion years after that, it will become a white dwarf star.
John and his sisters ands brothers and their cats will, of course, be dead by then.