Lend me your gases

By Eugenie Samuel NITROGEN in Earth’s atmosphere was carried here by comets, say scientists who’ve been studying Jupiter’s atmosphere. This supports the idea that other ingredients of life arrived in the same way, in a kind of cosmic starter pack. Researchers can trace the source of nitrogen by comparing the ratio of different isotopes. In our atmosphere, there are about 3 nitrogen-15 atoms for every 1000 nitrogen-14 atoms. But finding out the ratio elsewhere in the Universe is tricky,
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