October 31, 2025
Another trip around the Sun. A whole sky of possibilities.
Birthday · October 31, 2025
A little universe, just for you
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Selected image source ↗ APOD published October 31, 2025. Credit: Alex Rodriguez. A publication-date match, not a photo taken on your date. Independent of NASA.
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Halloween is an astronomy holiday and spooky shapes always seem to lurk in planet Earth's night skies. In fact, near the center of this telescopic view toward the constellation Cassiopeia these swept-back interstellar clouds IC 59 (left) and IC 63 look ghostly on a cosmic scale. About 600 light-years distant, the clouds aren't actually ghosts. They are slowly disappearing though, under the influence of energetic radiation from hot, luminous star gamma Cas. The brightest bluish star in the frame, Gamma Cas is physically located only 3 to 4 light-years from the nebulae. Slightly closer to gamma Cas, IC 63 is dominated by red H-alpha light emitted as hydrogen atoms ionized by the hot star's ultraviolet radiation recombine with electrons. Farther from the star IC 59 also shows H-alpha emission, and both nebulae shine with the characteristic blue tint of dust reflected star light. The field of view spans about 2 degrees or 20 light-years at the estimated distance of the interstellar apparitions.
Image credit: Alex Rodriguez
Explore October 31 in other years · 31 APOD entries, 1995–2025
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