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Won’t you be lost among the stars? Astronomy test for the pages of a school textbook

This star in the constellation Libra, 190 light years from us, contains extremely few elements heavier than hydrogen and helium. From which scientists concluded that she …

The star HD 140283, which has the unofficial name of Methuselah, was born in those distant times when the Universe was not yet enriched with the heavy elements produced in the stars.

is the oldest of all stars whose age has been reliably determined

… is the youngest of all stars whose age has been reliably determined

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