π Astronomy Picture of the Day: Unicorn, Fox Fur and Christmas Tree A star forming region cataloged as NGC 2264, this beautiful but complex arrangement of interstellar gas and dust is about 2,700 light-years distant in the faint but fanciful constellation Monoceros, the Unicorn. Seen toward the celestial equator and near the plane of our Milky Way galaxy, the seasonal skyscape mixes reddish emission nebulae excited by energetic light from newborn stars with dark interstellar dust clouds. Where the otherwise obscuring dust clouds lie close to the hot, young stars, they also reflect starlight, forming blue reflection nebulae. In fact, bright variable star S Monocerotis is immersed in a blue-tinted haze near center. Arrayed with a simple triangular outline above S Monocerotis, the stars of NGC 2264 are popularly known as the Christmas Tree star cluster. Carved by energetic starlight, the Cone Nebula sits upside down at the apex of this cosmic Christmas tree while the dusty, convoluted pelt of glowing gas and dust under the tree is called the Fox Fur Nebula. This rich telescopic frame spans about 1.5 degrees or 3 full moons on the sky top to bottom, covering nearly 80 light-years at the distance of NGC 2264. π Thursday, December 25, 2025 πΈ Β© Michael Kalika - Shared through genyapps (NASA Explorer) by @compez.eth - From Effort to Achievement β $GENY Helps You Share Your Path! π
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Phobos orbits Mars every 7.6 hours and is slowly spiraling inward. In ~50 million years it'll either crash into Mars or break apart into a ring. The surface grooves are still a mystery. Some think they're from tidal stress, others say impact chains. Wild that we can image it this clearly but still don't fully understand its geology. Phobos over Mars. Credit: ESA/DLR/FUBerlin/AndreaLuck CC BY
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