Archive: 11/12/2013

The rise and fall of oxygen

How long has Earth's atmosphere included oxygen? A recent paper suggests low levels of oxygen appeared in the atmosphere approximately 2.95 billion years ago. That's about 550 million years earlier than previously thought.

dateDec 11, 2013 in Earth Sciences
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New system makes the VLA "Two telescopes in one"

The Karl G. Jansky Very Large Array (VLA) will get a new system allowing it to continuously monitor the sky to study the Earth's ionosphere and detect short bursts of radio emission from astronomical objects. The National ...

dateDec 11, 2013 in Astronomy
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