| May 15
Oldest Signs of Life on Land Yet | | |
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| The oldest signs of life on land yet | | Fossils found in Australia - in ancient hot spring deposits - have
pushed back the earliest known evidence for land-based microbial life to 3.48 billion years. The work has implications for where life on Earth originated … land or ocean. | | | Lake Baikal: Earth's deepest, oldest lake | | | It's located near the Russian city of Irkutsk, one of the largest cities in Siberia with about half a million population. Controversy surrounds construction of hydropower stations on a river that feeds the lake. | | | Tonight … Meet Corvus the Crow | | | In 2017, let Jupiter and Spica, brightest star in Virgo, introduce you to the constellation Corvus the Crow. Corvus is recognizable for its compact, boxy shape. | | | | Where's the moon? Waning gibbous | | Watch for the moon late at night now, or before dawn. Last quarter moon will come on May 18 or 19, depending on your time zone. | | | | | |
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|  | | Tonight … Meet Corvus the Crow | | Corvus is recognizable for its compact, boxy shape. | | | | | |
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 | | Circumzenithal arc over Surrey, England | Tony Bowman caught this photo on Saturday with his phone. It's a circumzenithal arc. It looks like an upside-down rainbow, but it's caused by ice crystals, not rain. | | | | |
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