Analemma over the Callanish Stones

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 18 Analemma over the Callanish Stones Image Credit & Copyright: Giuseppe Petricca Explanation: If you went outside at the same time every day and took a picture that included the Sun, how would the Sun's position change? A more visual answer to that question is an analemma, a composite image taken from the same spot at the same time over the course of a year. The featured analemma was composed from images taken every few days at noon near the village of Callanish in the Outer Hebrides in Scotland, UK. In the foreground are the Callanish Stones, a stone circle built around 2700 BC during humanity's Bronze Age. It is not known if the placement of the Callanish Stones has or had astronomical significance. The ultimate causes for the figure-8 shape of this and all analemmas are the tilt of the Earth axis and the ellipticity of the Earth's orbit around the Sun. At the solstices, the Sun will appear at the top or bottom of an analemma.The featured image...

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The Tarantula Zone

APOD: 2022 September 16 - The Tarantula Zone Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 16 The Tarantula Zone Image Credit &Copyright: Processing -Robert GendlerData -Hubble Tarantula Treasury,European Southern Observatory,James Webb Space Telescope,Amateur Sources Explanation: The Tarantula Nebula,also known as 30 Doradus, is more than a thousand light-years in diameter,a giant star forming region within nearby satellite galaxy theLarge Magellanic Cloud.About 180 thousand light-years away, it's the largest,most violent star forming region known in the whole LocalGroup of galaxies.The cosmic arachnid sprawls acrossthis magnificent view,an assembly of image data from large space- and ground-based telescopes.Within the Tarantula (NGC 2070),intense radiation, stellar winds, and supernova shocksfrom the central young cluster of massive stars cataloged as R136energize the nebular glow and shape the spidery filaments.Around theTarantula are other star forming regions withyoung star clusters, filaments, and blown-outbubble-shaped clouds.In fact, the frame includes the site of the closest supernova in modern times,SN 1987A,at lower right.The rich field of view spans about 2 degreesor 4 full moons, in the southernconstellation Dorado.But were the Tarantula Nebula closer, say 1,500 light-years distant likethe Milky Way's own star forming...

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Perseverance in Jezero Crater s Delta

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 17 Perseverance in Jezero Crater's Delta Image Credit: NASA,JPL-Caltech,MSSS,ASU Explanation: The Perseverance rover's Mastcam-Z captured images to createthis mosaic on August 4, 2022.The car-sized robot was continuing its exploration of thefan-shaped delta of a river that, billionsof years ago, flowed into Jezero Crater on Mars.Sedimentary rockspreserved in Jezero's deltaare considered one ofthe best places on Mars to search for potential signs of ancientmicrobial life andsites recently sampled by the rover, dubbed Wildcat Ridge andSkinner Ridge, are at lower left and upper rightin the frame.The samples taken from these areas were sealed inside ultra-clean sampletubes, ultimately intended forreturn to Earth by future missions.Starting withthe Pathfinder Mission andMars Global Surveyor in 1997, the last25 years of a continuous robotic exploration of the Red Planet has includedorbiters,landers,rovers,and ahelicopter from planet Earth. Tomorrow's picture: stone circle analemma<| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors: Robert Nemiroff(MTU) &Jerry Bonnell (UMCP)NASA Official: Phillip NewmanSpecific rights apply.NASA WebPrivacy Policy and Important NoticesA service of:ASD atNASA /GSFC,NASA ScienceActivation& Michigan Tech....

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Harvest Moon over Sicily

APOD: 2022 September 15 - Harvest Moon over Sicily Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 15 Harvest Moon over Sicily Image Credit &Copyright: Dario Giannobile Explanation: For northern hemisphere dwellers,September's Full Moonwas the Harvest Moon.Reflecting warm hues at sunset it risesover the historic town of Castiglione di Sicilia inthis telephoto viewfrom September 9.Famed in festival, story, and songHarvest Moonis just the traditional name of the full moon nearestthe autumnal equinox.According to lore the name is a fitting one.Despite the diminishing daylight hours as the growing season drewto a close, farmers could harvest crops by the light of a full moonshining onfrom dusk to dawn. Harvest Full Moon 2022: Notable Submissions to APOD Tomorrow's picture: pixels in space<| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors: Robert Nemiroff(MTU) &Jerry Bonnell (UMCP)NASA Official: Phillip NewmanSpecific rights apply.NASA WebPrivacy Policy and Important NoticesA service of:ASD atNASA /GSFC,NASA ScienceActivation& Michigan Tech. U.

The Tarantula Zone

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 16 The Tarantula Zone Image Credit &Copyright: Processing -Robert Gendler,Roberto ColombariData -Hubble Tarantula Treasury,European Southern Observatory,James Webb Space Telescope,Amateur Sources Explanation: The Tarantula Nebula,also known as 30 Doradus, is more than a thousand light-years in diameter,a giant star forming region within nearby satellite galaxy theLarge Magellanic Cloud.About 180 thousand light-years away, it's the largest,most violent star forming region known in the whole LocalGroup of galaxies.The cosmic arachnid sprawls acrossthis magnificent view,an assembly of image data from large space- and ground-based telescopes.Within the Tarantula (NGC 2070),intense radiation, stellar winds, and supernova shocksfrom the central young cluster of massive stars cataloged as R136energize the nebular glow and shape the spidery filaments.Around theTarantula are other star forming regions withyoung star clusters, filaments, and blown-outbubble-shaped clouds.In fact, the frame includes the site of the closest supernova in modern times,SN 1987A,at lower right.The rich field of view spans about 2 degreesor 4 full moons, in the southernconstellation Dorado.But were the Tarantula Nebula closer, say 1,500 light-years distant likethe Milky Way's own star forming Orion Nebula,it...

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Waves of the Great Lacerta Nebula

APOD: 2022 September 14 - Waves of the Great Lacerta Nebula Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 14 Waves of the Great Lacerta Nebula Image Credit & Copyright: Jarmo Ruuth, Telescope Live; Text: Ata Sarajedini (Florida Atlantic U., Astronomy Minute podcast) Explanation: It is one of the largest nebulas on the sky -- why isn't it better known?Roughly the same angular size as the Andromeda Galaxy, the Great Lacerta Nebula can be found toward the constellation of the Lizard (Lacerta).The emission nebula is difficult to see with wide-field binoculars because it is so faint, but also usually difficult to see with a large telescope because it is so great in angle -- spanning about three degrees.The depth, breadth, waves, and beauty of the nebula -- cataloged as Sharpless 126 (Sh2-126) -- can best be seen and appreciated with a long duration camera exposure.The featured image is one such combined exposure -- in this case 10 hours over five different colors and over six nights during this past June and July at the IC Astronomy Observatory in Spain.The hydrogen gas in the...

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Harvest Moon over Sicily

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 15 Harvest Moon over Sicily Image Credit &Copyright: Dario Giannobile Explanation: For northern hemisphere dwellers,September's Full Moonwas the Harvest Moon.Reflecting warm hues at sunset it risesover the historic town of Castiglione di Sicilia inthis telephoto viewfrom September 9.Famed in festival, story, and songHarvest Moonis just the traditional name of the full moon nearestthe autumnal equinox.According to lore the name is a fitting one.Despite the diminishing daylight hours as the growing season drewto a close, farmers could harvest crops by the light of a full moonshining onfrom dusk to dawn. Harvest Full Moon 2022: Notable Submissions to APOD Tomorrow's picture: pixels in space<| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors: Robert Nemiroff(MTU) &Jerry Bonnell (UMCP)NASA Official: Phillip NewmanSpecific rights apply.NASA WebPrivacy Policy and Important NoticesA service of:ASD atNASA /GSFC,NASA ScienceActivation& Michigan Tech. U.

A Long Snaking Filament on the Sun

APOD: 2022 September 13 - A Long Snaking Filament on the Sun Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 13 A Long Snaking Filament on the Sun Image Credit & Copyright: Alan Friedman(Averted Imagination) Explanation: Earlier this month, the Sun exhibited one of the longer filaments on record. Visible as the bright curving streak around the image center, the snaking filament's full extent was estimated to be overhalf of the Sun's radius -- more than 350,000 kilometers long.A filament is composed of hot gas held aloft by the Sun's magnetic field, so that viewed from the side it would appear as a raised prominence. A different, smaller prominence is simultaneously visible at the Sun's edge.The featured image is in false-color and color-inverted to highlight not only the filament but the Sun's carpet chromosphere. The bright dot on the upper right is actually a dark sunspot about the size of the Earth. Solarfilaments typically last from hours to days, eventually collapsing to return hot plasma back to the Sun.Sometimes, though, they explode and expel particles into the Solar System, some of which trigger...

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Waves of the Great Lacerta Nebula

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 14 Waves of the Great Lacerta Nebula Image Credit & Copyright: Jarmo Ruuth, Telescope Live; Text: Ata Sarajedini (Florida Atlantic U., Astronomy Minute podcast) Explanation: It is one of the largest nebulas on the sky -- why isn't it better known?Roughly the same angular size as the Andromeda Galaxy, the Great Lacerta Nebula can be found toward the constellation of the Lizard (Lacerta).The emission nebula is difficult to see with wide-field binoculars because it is so faint, but also usually difficult to see with a large telescope because it is so great in angle -- spanning about three degrees.The depth, breadth, waves, and beauty of the nebula -- cataloged as Sharpless 126 (Sh2-126) -- can best be seen and appreciated with a long duration camera exposure.The featured image is one such combined exposure -- in this case 10 hours over five different colors and over six nights during this past June and July at the IC Astronomy Observatory in Spain.The hydrogen gas in the Great Lacerta Nebula glows red because...

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Red Sprite Lightning over the Czech Republic

APOD: 2022 September 12 - Red Sprite Lightning over the Czech Republic Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 12 Red Sprite Lightning over the Czech Republic Image Credit & Copyright: Daniel Ščerba Explanation: What are those red filaments in the sky?They are a rarely seen form of lightning confirmed only about 35 years ago: red sprites.Research has shown that following a powerful positivecloud-to-ground lightning strike,red sprites may start as 100-meter balls ofionizedair that shoot down from about80-km high at 10 percent the speed of light.They arequickly followedby a group of upward streaking ionized balls.The featured image was taken late last month from the Jeseniky Mountains in northern Moravia in the Czech Republic.The distance to the red sprites is about 200 kilometers.Red sprites take only a fraction of a second to occur and are best seen whenpowerful thunderstorms are visible from the side. APOD in world languages: Arabic,Bulgarian,Catalan,Chinese (Beijing),Chinese (Taiwan),Croatian, Czech,Dutch,Farsi, French, French (Canada),German, Hebrew, Indonesian,Japanese,Korean, Montenegrin, Polish,Russian,Serbian, Slovenian, Spanish,Taiwanese, Turkish,and Ukrainian Tomorrow's picture: sun snake <| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors:...

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A Long Snaking Filament on the Sun

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 13 A Long Snaking Filament on the Sun Image Credit & Copyright: Alan Friedman(Averted Imagination) Explanation: Earlier this month, the Sun exhibited one of the longer filaments on record. Visible as the bright curving streak around the image center, the snaking filament's full extent was estimated to be overhalf of the Sun's radius -- more than 350,000 kilometers long.A filament is composed of hot gas held aloft by the Sun's magnetic field, so that viewed from the side it would appear as a raised prominence. A different, smaller prominence is simultaneously visible at the Sun's edge.The featured image is in false-color and color-inverted to highlight not only the filament but the Sun's carpet chromosphere. The bright dot on the upper right is actually a dark sunspot about the size of the Earth. Solarfilaments typically last from hours to days, eventually collapsing to return hot plasma back to the Sun.Sometimes, though, they explode and expel particles into the Solar System, some of which trigger auroras on Earth.The pictured filament appeared in...

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Planets of the Solar System: Tilts and Spins

APOD: 2022 September 11 - Planets of the Solar System: Tilts and Spins Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. Planets of the Solar System: Tilts and Spins Video Credit: NASA, Animation: James O'Donoghue (JAXA) Explanation: How does your favorite planet spin?Does it spin rapidly around a nearly vertical axis, or horizontally, or backwards? The featured video animates NASA images of all eight planets in our Solar System to show them spinning side-by-side for an easy comparison.In the time-lapse video, a day on Earth -- one Earth rotation -- takes just a few seconds. Jupiter rotates the fastest, while Venus spins not only the slowest (can you see it?), but backwards. The inner rocky planets across the top underwent dramatic spin-altering collisions during the early days of the Solar System. Why planets spin and tilt as they do remains a topic of research with much insight gained from modern computer modeling and the recent discovery and analysis of hundreds of exoplanets: planets orbiting other stars. Tomorrow's picture: stars and sprites <| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors...

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Red Sprite Lightning over the Czech Republic

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 12 Red Sprite Lightning over the Czech Republic Image Credit & Copyright: Daniel Ščerba Explanation: What are those red filaments in the sky?They are a rarely seen form of lightning confirmed only about 35 years ago: red sprites.Research has shown that following a powerful positivecloud-to-ground lightning strike,red sprites may start as 100-meter balls ofionizedair that shoot down from about80-km high at 10 percent the speed of light.They arequickly followedby a group of upward streaking ionized balls.The featured image was taken late last month from the Jeseniky Mountains in northern Moravia in the Czech Republic.The distance to the red sprites is about 200 kilometers.Red sprites take only a fraction of a second to occur and are best seen whenpowerful thunderstorms are visible from the side. APOD in world languages: Arabic,Bulgarian,Catalan,Chinese (Beijing),Chinese (Taiwan),Croatian, Czech,Dutch,Farsi, French, French (Canada),German, Hebrew, Indonesian,Japanese,Korean, Montenegrin, Polish,Russian,Serbian, Slovenian, Spanish,Taiwanese, Turkish,and Ukrainian Tomorrow's picture: sun snake <| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors: Robert Nemiroff(MTU) &Jerry Bonnell (UMCP)NASA Official: Phillip...

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Galaxy by the Lake

APOD: 2022 September 10 - Galaxy by the Lake Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. 2022 September 10 Galaxy by the Lake Image Credit &Copyright: Gerardo Ferrarino Explanation: This 180 degree panoramicnight skyscape captures ourMilky Way Galaxyas it arcs above the horizon on a winter's night in August.Near midnight, the galactic center is close to the zenith withthe clear waters of Lake Traful, Neuquen, Argentina,South America, planet Earth below.Zodiacal light,dust reflected sunlight along the Solar System's ecliptic plane,is also visible in the region's very dark night sky.The faint band of light reaches up from the distant snowy peakstoward the galaxy's center.Follow the arcof the Milky Way to the left to find thesouthern hemispherestellar beaconsAlpha and Beta Centauri.Close to the horizon bright star Vega is reflected in the calmmountain lake. Tomorrow's picture: tilt and spin<| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors: Robert Nemiroff(MTU) &Jerry Bonnell (UMCP)NASA Official: Phillip NewmanSpecific rights apply.NASA WebPrivacy Policy and Important NoticesA service of:ASD atNASA /GSFC,NASA ScienceActivation& Michigan Tech. U.

Planets of the Solar System: Tilts and Spins

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe isfeatured, along with a brief explanation written by a professional astronomer. Planets of the Solar System: Tilts and Spins Video Credit: NASA, Animation: James O'Donoghue (JAXA) Explanation: How does your favorite planet spin?Does it spin rapidly around a nearly vertical axis, or horizontally, or backwards? The featured video animates NASA images of all eight planets in our Solar System to show them spinning side-by-side for an easy comparison.In the time-lapse video, a day on Earth -- one Earth rotation -- takes just a few seconds. Jupiter rotates the fastest, while Venus spins not only the slowest (can you see it?), but backwards. The inner rocky planets, across the top, most certainly underwent dramatic spin-altering collisions during the early days of the Solar System. The reasons why planets spin and tilt as they do remains a topic of research with much insight gained from modern computer modeling and the recent discovery and analysis of hundreds of exoplanets: planets orbiting other stars. Tomorrow's picture: stars and sprites <| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors: Robert Nemiroff(MTU)...

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