| | February 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. | | | | | | 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! | | | | | |
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 | | | 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. | | |
