Aurora australis, the southern lights, are caused by solarwind passing through the upper atmosphere. The southern lights are seen less often than aurora borealis, the northern lights, because few people brave Antarctica's dark, freezing winters.

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Leonid Fireball over Tenerife (Nov 22 2011)  Image Credit & Copyright: Juergen Rendtel (AIP Potsdam), IMO Historically active, this year's Leonid meteor shower was diminished by bright moonlight. Still, faithful night sky watchers did see the shower peak on November 18 and even the glare of moonlight didn't come close to masking this brilliant fireball meteor. The colorful meteor trail and final flare was captured early that morning in western skies over the Canary Island (...) #astronomy

Leonid Fireball over Tenerife (Nov 22 2011) Image Credit & Copyright: Juergen Rendtel (AIP Potsdam), IMO Historically active, this year's Leonid meteor shower was diminished by bright moonlight. Still, faithful night sky watchers did see the shower peak on November 18 and even the glare of moonlight didn't come close to masking this brilliant fireball meteor. The colorful meteor trail and final flare was captured early that morning in western skies over the Canary Island (...) #astronomy

2001 May 20 - Sagittarius Star Cloud. The color of a star indicates its surface temperature. Most stars in the Sagittarius Star Cloud are orange or red and relatively faint, as our Sun would appear. The blue and greenish stars are hotter, relatively young and massive. The bright red stars are cool Red Giants, bloated stars that have entered a more advanced stage of evolution. Some of the oldest stars known are located in this famous grouping.

2001 May 20 - Sagittarius Star Cloud. The color of a star indicates its surface temperature. Most stars in the Sagittarius Star Cloud are orange or red and relatively faint, as our Sun would appear. The blue and greenish stars are hotter, relatively young and massive. The bright red stars are cool Red Giants, bloated stars that have entered a more advanced stage of evolution. Some of the oldest stars known are located in this famous grouping.

A Fox Fur, a Unicorn, and a Christmas Tree Image Credit: Rolf Geissinger Explanation: What do the following things have in common: a cone, the fur of a fox, and a Christmas tree? Answer: they all occur in the constellation of the unicorn (Monoceros).

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