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Showing posts from February 2, 2019

Astronomy Picture of the Day: An Airglow Fan from Lake to Sky

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An Airglow Fan from Lake to Sky
Why would the sky look like a giant fan? Airglow. The featured intermittent green glow appeared to rise from a lake through the arch of our Milky Way Galaxy, as captured during 2015 next to Bryce Canyon in Utah, USA. The unusual pattern was created by atmospheric gravity waves, ripples of alternating air pressure that can grow with height as the air thins, in this case about 90 kilometers up. Unlike auroras powered by collisions with energetic charged particles and seen at high latitudes, airglow is due to chemiluminescence, the production of light in a chemical reaction. More typically seen near the horizon, airglow keeps the night sky from ever being completely dark.

February 03, 2019
via NASA https://go.nasa.gov/2GlQRP5 Manage this Applet
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What will we name the solar system’s next planet?

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Space Even in space, bureaucracy exists. How will the International Astronomical Union name a ninth planet in our solar system? It decides the official names of stellar objects, but there’s no precedent for… via Popular Science "http://bit.ly/2WCDvne"