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Thursday, February 21, 2019

Feb 21 - Earth's Atmosphere Extends Beyond Moon

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The outermost part of Earth's atmosphere - called its geocorona - extends outward almost twice as far as the moon's orbit. Artist's concept via ESA.
Earth's atmosphere extends beyond moon
In fact, these researchers said, the moon flies through Earth's outermost atmosphere. Read more.
The ozone hole is recovering
After thinning at alarming rates in the 1980s and 90s, the ozone layer over Antarctica is starting to recover, thanks to human intervention. Take 2 minutes see for yourself how ozone concentrations have changed from 1979 through 2018. Watch video.
Firefall at Yosemite National Park
Around this time of year - if the western horizon stays clear - the last few minutes of daylight fall perfectly on Yosemite's Horsetail Falls, making it glow as if on fire. Photographers call it the firefall ... Read more.

@MikeMezPhoto caught the firefall this week. Thank you, Mike!

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Tonight … Zodiacal light, a glowing pyramid after dark
From the Northern Hemisphere, look after true darkness falls for the elusive zodiacal light. It appears as a hazy pyramid of light extending up from the sunset point. Southern Hemisphere? Look before dawn!
How to spot Canopus, sky’s 2nd-brightest star
Project Nightflight, a Vienna-based astrophotography group, caught Canopus over the island of La Palma in Spain’s Canary Islands. Read more.
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