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In the near future, we will begin to find Earth-like planets around other stars. We will then start to search those planets for signs of life.
Let us assume that the full lifetime of our Sun, from its birth to its death, is 12.2 billion years.
If we assume that it would take life 930 million years to become sufficiently well-established on a given planet that we could detect it from the Earth, what is the mass of the most massive star that could host a detectably habitable planet?
Answer
times the mass of the Sun.
Note:
One million = 1 000 000 = 1 x 106
One billion = 1 000 000 000 = 1 000 million = 1 x 109
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