Oxygen accounts for about 21% of Earth's air, with the rest of our atmosphere primarily nitrogen. And most living things - including people, as we well know - need oxygen to survive.
<p>WASHINGTON — Oxygen accounts for about 21% of Earth's air, with the rest of our atmosphere primarily nitrogen.
</p><p>Using an instrument aboard the SOFIA airborne observatory — a Boeing 747SP aircraft modified to carry an infrared telescope in a joint project between NASA and the German Aerospace Cen
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