{"version": "https://jsonfeed.org/version/1.1", "title": "Astronomy Picture of the Day [ko]", "feed_url": "https://apod.com/en/", "home_page_url": "56", "description": "Astronomy Picture of the Day", "icon": null, "favicon": null, "authors": [{"name": "Unknown", "url": null, "avatar": null}], "language": "en", "expired": null, "hub": null, "items": [{"id": "https://apod.nasa.gov/apod/ap261027.html", "url": "https://science.nasa.gov/image-article/apod-2026-october-27-noctilucent-clouds-over-sweden/", "external_url": null, "title": "Noctilucent Clouds over Sweden", "content_text": "", "content_html": "\"A
Explanation: \n\nExplanation: Sometimes it's night on the ground but day in the air. As the Earth rotates to eclipse the Sun, sunset rises upfrom the ground. Therefore, at sunset on the ground, sunlight still shines on clouds above. Under usual circumstances, a pretty sunset might be visible, but unusual noctilucent clouds float so high up they can be seen well after dark. Normally too dim to be seen, they may become visible just after sunset during the summer when illuminated by sunlight from below the horizon. Noctilucent clouds are the highest clouds and are known more technically as polar mesospheric clouds. Featured here as they appeared in early August, a network of blue noctilucent clouds was captured in the distant sky above a field of green grass near Link\u00f6ping, Sweden, with trees in stark silhouette across the horizon. Much about noctilucent clouds has been discovered only in the past two decades, while how they form and evolve remains a topic of active research.

Tomorrow's picture: round and round", "summary": "\"A
Explanation: \n\nExplanation: Sometimes it's night on the ground but day in the air. As the Earth rotates to eclipse the Sun, sunset rises upfrom the ground. Therefore, at sunset on the ground, sunlight still shines on clouds above. Under usual circumstances, a pretty sunset might be visible, but unusual noctilucent clouds float so high up they can be seen well after dark. Normally too dim to be seen, they may become visible just after sunset during the summer when illuminated by sunlight from below the horizon. Noctilucent clouds are the highest clouds and are known more technically as polar mesospheric clouds. Featured here as they appeared in early August, a network of blue noctilucent clouds was captured in the distant sky above a field of green grass near Link\u00f6ping, Sweden, with trees in stark silhouette across the horizon. Much about noctilucent clouds has been discovered only in the past two decades, while how they form and evolve remains a topic of active research.

Tomorrow's picture: round and round", "image": null, "banner_image": null, "date_published": "2026-10-27T03:00:00Z", "date_modified": "2026-10-27T03:00:00Z", "authors": ["Jerry Bonnell (UMCP)"], "tags": [], "language": null, "attachments": ["\n {\"url\": string, \n 'mime_type': string, \n 'title': strinrg,\n 'size_in_bytes': int,\n 'duration_in_seconds': int\n "]}, {"id": "https://apod.nasa.gov/apod/ap261026.html", "url": "https://science.nasa.gov/image-article/2026-october-26-m42-the-great-nebula-in-orion/", "external_url": null, "title": "M42: The Great Nebula in Orion", "content_text": "", "content_html": "\"A
Explanation: \n\nExplanation: The Great Nebula in Orion, an immense, nearby starbirth region, is one the most famous of all astronomical nebulas. Here, glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud only 1500 light-years away. In the featured deep image in assigned colors highlighted by emission in hydrogen, wisps and sheets of dust and gas are particularly evident. The Great Nebula in Orion can be found with the unaided eye near the easily identifiable belt of three stars in the popular constellation Orion. In addition to housing a bright open cluster of stars known as the Trapezium, the Orion Nebula contains many stellar nurseries. These nurseries contain much hydrogen gas, hot young stars, proplyds, and stellar jets spewing material at high speeds. Also known as M42, the Orion Nebula spans about 40 light years and is located in the same spiral arm of our Galaxy as the Sun.

Tomorrow's picture: open space", "summary": "\"A
Explanation: \n\nExplanation: The Great Nebula in Orion, an immense, nearby starbirth region, is one the most famous of all astronomical nebulas. Here, glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud only 1500 light-years away. In the featured deep image in assigned colors highlighted by emission in hydrogen, wisps and sheets of dust and gas are particularly evident. The Great Nebula in Orion can be found with the unaided eye near the easily identifiable belt of three stars in the popular constellation Orion. In addition to housing a bright open cluster of stars known as the Trapezium, the Orion Nebula contains many stellar nurseries. These nurseries contain much hydrogen gas, hot young stars, proplyds, and stellar jets spewing material at high speeds. Also known as M42, the Orion Nebula spans about 40 light years and is located in the same spiral arm of our Galaxy as the Sun.

Tomorrow's picture: open space", "image": null, "banner_image": null, "date_published": "2026-10-26T03:00:00Z", "date_modified": "2026-10-26T03:00:00Z", "authors": ["Jerry Bonnell (UMCP)"], "tags": [], "language": null, "attachments": ["\n {\"url\": string, \n 'mime_type': string, \n 'title': strinrg,\n 'size_in_bytes': int,\n 'duration_in_seconds': int\n "]}, {"id": "https://apod.nasa.gov/apod/ap261025.html", "url": "https://science.nasa.gov/image-article/apod-2026-october-25-dark-matter-in-a-simulated-universe/", "external_url": null, "title": "Dark Matter in a Simulated Universe", "content_text": "", "content_html": "\"The
Explanation: \n\nExplanation: Is our universe haunted? It might look that way on this dark matter map. The gravity of unseen dark matter is the leading explanation for why galaxies rotate so fast, why galaxies orbit clusters so fast, why gravitational lenses so strongly deflect light, and how visible matter is distributed. The featured image from the American Museum of Natural History's Hayden Planetarium Space Show, Dark Universe, highlights one example of how pervasive dark matter might haunt our universe. In this frame from a detailed computer simulation, complex filaments of dark matter, shown in black, are strewn about the universe like spider webs, while the relatively rare clumps of familiar baryonic matter are colored orange. These simulations are good statistical matches to astronomical observations. In what is perhaps a scarier turn of events, dark matter -- although quite strange and in an unknown form -- is no longer thought to be the strangest source of gravity in the universe. That honor now falls to dark energy, a more uniform source of repulsive gravity that seems to now dominate the expansion of the entire universe.

Tomorrow's picture: Orion the Great", "summary": "\"The
Explanation: \n\nExplanation: Is our universe haunted? It might look that way on this dark matter map. The gravity of unseen dark matter is the leading explanation for why galaxies rotate so fast, why galaxies orbit clusters so fast, why gravitational lenses so strongly deflect light, and how visible matter is distributed. The featured image from the American Museum of Natural History's Hayden Planetarium Space Show, Dark Universe, highlights one example of how pervasive dark matter might haunt our universe. In this frame from a detailed computer simulation, complex filaments of dark matter, shown in black, are strewn about the universe like spider webs, while the relatively rare clumps of familiar baryonic matter are colored orange. These simulations are good statistical matches to astronomical observations. In what is perhaps a scarier turn of events, dark matter -- although quite strange and in an unknown form -- is no longer thought to be the strangest source of gravity in the universe. That honor now falls to dark energy, a more uniform source of repulsive gravity that seems to now dominate the expansion of the entire universe.

Tomorrow's picture: Orion the Great", "image": null, "banner_image": null, "date_published": "2026-10-25T03:00:00Z", "date_modified": "2026-10-25T03:00:00Z", "authors": ["Jerry Bonnell (UMCP)"], "tags": [], "language": null, "attachments": ["\n {\"url\": string, \n 'mime_type': string, \n 'title': strinrg,\n 'size_in_bytes': int,\n 'duration_in_seconds': int\n "]}, {"id": "https://apod.nasa.gov/apod/ap261024.html", "url": "https://science.nasa.gov/image-article/apod-2026-october-24-rosettas-selfie/", "external_url": null, "title": "Rosetta's Selfie", "content_text": "", "content_html": "\"Image
Explanation: \n\nExplanation: This Rosetta spacecraft selfie was snapped on October 7th, 2014. At the time the comet-chasing spacecraft was about 472 million kilometers from planet Earth, but only 16 kilometers from the surface of comet 67P/Churyumov-Gerasimenko. Looming beyond the spacecraft near the top of the frame, dust and gas stream away from the comet's curious double-lobed nucleus. Bright sunlight glints off one of Rosetta's 14 meter long solar arrays. In fact, two exposures, one short and one long, were combined to record the dramatic high contrast scene using the CIVA camera system on Rosetta's still-attached Philae lander. Its chosen primary landing site was on the visible hemisphere of the smaller lobe of the nucleus. This was the last image from Philae's camera before the lander separated from Rosetta on November 12. Shortly after separation Philae took another image looking back toward the orbiter and began its descent to the nucleus of the comet.

Tomorrow's picture: dark matters
", "summary": "\"Image
Explanation: \n\nExplanation: This Rosetta spacecraft selfie was snapped on October 7th, 2014. At the time the comet-chasing spacecraft was about 472 million kilometers from planet Earth, but only 16 kilometers from the surface of comet 67P/Churyumov-Gerasimenko. Looming beyond the spacecraft near the top of the frame, dust and gas stream away from the comet's curious double-lobed nucleus. Bright sunlight glints off one of Rosetta's 14 meter long solar arrays. In fact, two exposures, one short and one long, were combined to record the dramatic high contrast scene using the CIVA camera system on Rosetta's still-attached Philae lander. Its chosen primary landing site was on the visible hemisphere of the smaller lobe of the nucleus. This was the last image from Philae's camera before the lander separated from Rosetta on November 12. Shortly after separation Philae took another image looking back toward the orbiter and began its descent to the nucleus of the comet.

Tomorrow's picture: dark matters
", "image": null, "banner_image": null, "date_published": "2026-10-24T03:00:00Z", "date_modified": "2026-10-24T03:00:00Z", "authors": ["Jerry Bonnell (UMCP)"], "tags": [], "language": null, "attachments": ["\n {\"url\": string, \n 'mime_type': string, \n 'title': strinrg,\n 'size_in_bytes': int,\n 'duration_in_seconds': int\n "]}, {"id": "https://apod.nasa.gov/apod/ap261023.html", "url": "https://science.nasa.gov/image-article/apod-2026-october-23-andromeda-in-southern-spring/", "external_url": null, "title": "Andromeda in Southern Spring", "content_text": "", "content_html": "\"The
Explanation: \n\nExplanation: Looking toward the north from Mullion, New South Wales, Australia, the Andromeda Galaxy never gets more than a few degrees above the horizon. During the southern hemisphere spring, Andromeda is highest in the sky around midnight though. And in this telephoto scene from October 10/11, multiple exposures were used to reveal the spiral galaxy in tantalizing detail as it climbed above rolling Australian hills. Also known as M31, the Andromeda Galaxy is one of the brightest objects in the Messier catalog, but is only visible to the unaided eye as a small, faint, fuzzy patch. Digitally tracked and stacked frames were combined with a foreground shot in the deep astro-image composite to reveal the galaxy's greater extent in planet Earth's night. In the springtime night skyscape,the closest large spiral galaxy spans nearly 6 full moons.

Tomorrow's picture: pixels in space
", "summary": "\"The
Explanation: \n\nExplanation: Looking toward the north from Mullion, New South Wales, Australia, the Andromeda Galaxy never gets more than a few degrees above the horizon. During the southern hemisphere spring, Andromeda is highest in the sky around midnight though. And in this telephoto scene from October 10/11, multiple exposures were used to reveal the spiral galaxy in tantalizing detail as it climbed above rolling Australian hills. Also known as M31, the Andromeda Galaxy is one of the brightest objects in the Messier catalog, but is only visible to the unaided eye as a small, faint, fuzzy patch. Digitally tracked and stacked frames were combined with a foreground shot in the deep astro-image composite to reveal the galaxy's greater extent in planet Earth's night. In the springtime night skyscape,the closest large spiral galaxy spans nearly 6 full moons.

Tomorrow's picture: pixels in space
", "image": null, "banner_image": null, "date_published": "2026-10-23T03:00:00Z", "date_modified": "2026-10-23T03:00:00Z", "authors": ["Jerry Bonnell (UMCP)"], "tags": [], "language": null, "attachments": ["\n {\"url\": string, \n 'mime_type': string, \n 'title': strinrg,\n 'size_in_bytes': int,\n 'duration_in_seconds': int\n "]}, {"id": "https://apod.nasa.gov/apod/ap261022.html", "url": "https://science.nasa.gov/image-article/apod-2026-october-22-the-first-green-star-wd-j13306435/", "external_url": null, "title": "The First Green Star, WD J1330+6435", "content_text": "", "content_html": "\"A
Explanation: \n\nExplanation: Star light, star bright: is there a green star out tonight? Other than the Sun, all stars are so far from Earth that they appear as points in the sky. They are mostly white, but sometimes noticeably red or blue. This color typically relates to the temperature: blue stars are hotter than red stars. What about other colors? The featured image is an illustration showing WD J1330+6435, a white dwarf star, surrounded by an accretion disk with gas and rocks orbiting the star. White dwarfs are small, faint stars that are left over when a star like the Sun exhausts its nuclear fuel. Astronomers recently found that some white dwarf stars, despite their name, would appear yellow, green, cyan, pink, or purple. In these cases, trace elements that were accreted to these stars interact with the stellar atmosphere and shift its normally white color. But, alas! I wish I may, I wish I might, but they are too faint to see tonight...

Tomorrow's picture: eye in the sky", "summary": "\"A
Explanation: \n\nExplanation: Star light, star bright: is there a green star out tonight? Other than the Sun, all stars are so far from Earth that they appear as points in the sky. They are mostly white, but sometimes noticeably red or blue. This color typically relates to the temperature: blue stars are hotter than red stars. What about other colors? The featured image is an illustration showing WD J1330+6435, a white dwarf star, surrounded by an accretion disk with gas and rocks orbiting the star. White dwarfs are small, faint stars that are left over when a star like the Sun exhausts its nuclear fuel. Astronomers recently found that some white dwarf stars, despite their name, would appear yellow, green, cyan, pink, or purple. In these cases, trace elements that were accreted to these stars interact with the stellar atmosphere and shift its normally white color. But, alas! I wish I may, I wish I might, but they are too faint to see tonight...

Tomorrow's picture: eye in the sky", "image": null, "banner_image": null, "date_published": "2026-10-22T03:00:00Z", "date_modified": "2026-10-22T03:00:00Z", "authors": ["Jerry Bonnell (UMCP)"], "tags": [], "language": null, "attachments": ["\n {\"url\": string, \n 'mime_type': string, \n 'title': strinrg,\n 'size_in_bytes': int,\n 'duration_in_seconds': int\n "]}, {"id": "https://apod.nasa.gov/apod/ap261021.html", "url": "https://science.nasa.gov/image-article/apod-2026-october-21-new-ghosts-revealed-in-cassiopeia/", "external_url": null, "title": "New Ghosts Revealed in Cassiopeia", "content_text": "", "content_html": "\"The
Explanation: \n\nExplanation: Jinkies, look at all those ghosts! It took 100 hours of observation and a special oxygen filter for today\u2019s image to capture three faint nebulas hidden in the Cassiopeia constellation. IC 59 and IC 63, the original Ghosts of Cassiopeia, haunt the region near multi-star system \u03b3 Cassiopeia. Energetic light from \u03b3 Cassiopeia causes the hydrogen gas in IC 59 and 63 to glow red. Their dust reflects and scatters some blue-ish white starlight. Newly discovered Objects 1, 2, and 3 appear as blue phantoms, revealing the presence of ionized oxygen. But ionized by what? Like at the bow of a speeding boat, \u03b3 Cassiopeia may be piling up material as the system moves through interstellar gas and dust. It follows that Object 3 may be the compressed and heated oxygen of that bow shock. Object 1 could be a planetary nebula if a central white dwarf is identified. The origins of these astronomical apparitions remain a mystery to be solved.

Tomorrow's picture: it's not easy being green", "summary": "\"The
Explanation: \n\nExplanation: Jinkies, look at all those ghosts! It took 100 hours of observation and a special oxygen filter for today\u2019s image to capture three faint nebulas hidden in the Cassiopeia constellation. IC 59 and IC 63, the original Ghosts of Cassiopeia, haunt the region near multi-star system \u03b3 Cassiopeia. Energetic light from \u03b3 Cassiopeia causes the hydrogen gas in IC 59 and 63 to glow red. Their dust reflects and scatters some blue-ish white starlight. Newly discovered Objects 1, 2, and 3 appear as blue phantoms, revealing the presence of ionized oxygen. But ionized by what? Like at the bow of a speeding boat, \u03b3 Cassiopeia may be piling up material as the system moves through interstellar gas and dust. It follows that Object 3 may be the compressed and heated oxygen of that bow shock. Object 1 could be a planetary nebula if a central white dwarf is identified. The origins of these astronomical apparitions remain a mystery to be solved.

Tomorrow's picture: it's not easy being green", "image": null, "banner_image": null, "date_published": "2026-10-21T03:00:00Z", "date_modified": "2026-10-21T03:00:00Z", "authors": ["Jerry Bonnell (UMCP)"], "tags": [], "language": null, "attachments": ["\n {\"url\": string, \n 'mime_type': string, \n 'title': strinrg,\n 'size_in_bytes': int,\n 'duration_in_seconds': int\n "]}]}