They'll be the 2 brightest sky objects up before the sun on the morning of March 2, 2019 - the moon and Venus - in the east at dawn. See the chart below and read more.
Earth's atmosphere contains about 21% oxygen today. Plants produce it, and animals - including humans - breathe it. Ancient rocks provide clues about when the oxygen in Earth's atmosphere began to arise. Read more.
The Mobius Arch is one of the dozens of natural arches in California's Alabama Hills. Photography of the Eternal Nomad captured this lunar halo during the February 18-19 full moon.
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