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zxxlyzq
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Date Posted:09/03/2018 12:10 PMCopy HTML

See Explanation.  Clicking on the picture will download the highest resolution version available.

Horsehead: A Wider View 
Composition and Processing: Robert Gendler 
Image Data: ESOVISTAHLAHubble Heritage Team (STScI/AURA)

Explanation: Combined image data from the massive, ground-based VISTA telescope and the Hubble Space Telescope was used to create this wide perspective of the interstellar landscape surrounding the famous Horsehead Nebula. Captured at near-infrared wavelengths, the region's dusty molecular cloud sprawls across the scene that covers an angle about two-thirds the size of the Full Moon on the sky. Left to right the frame spans just over 10 light-years at the Horsehead's estimated distance of 1,600 light-years. Also known as Barnard 33, the still recognizable Horsehead Nebula stands at the upper right, the near-infrared glow of a dusty pillar topped with newborn stars. Below and left, the bright reflection nebula NGC 2023 is itself the illuminated environs of a hot young star. Obscuring clouds below the base of the Horsehead and on the outskirts of NGC 2023 show the tell-tale far red emission of energetic jets, known as Herbig-Haro objects, also associated with newborn stars.

Rockymz Share to: Facebook Twitter MSN linkedin google yahoo #211
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Re:NASA pics

Date Posted:25/11/2024 10:19 AMCopy HTML

2024 November 25
The top half glows red, while the bottom half is filled
 with dark dust. Protruding into the red is a dark dust
lane that resembles a horse's head. 
Please see the explanation for more detailed information.

The Horsehead Nebula
Image Credit & Copyright: Alex Lin (Chilescope)

Explanation: One of the most identifiable nebulas in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s. The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming. Light takes about 1,500 years to reach us from the Horsehead Nebula. The featured image was taken from the Chilescope Observatory in the mountains of Chile.


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Re:NASA pics

Date Posted:24/11/2024 10:09 AMCopy HTML

2023 December 5
An illustrations depicts a high energy cosmic ray
starting an air shower in the Earth's atmosphere. Below
is an array of air shower detectors. 
Please see the explanation for more detailed information.

Energetic Particle Strikes the Earth
Illustration Credit: Osaka Metropolitan U./L-INSIGHTKyoto U./Ryuunosuke Takeshige

Explanation: It was one of the most energetic particles ever known to strike the Earth -- but where did it come from? Dubbed Amaterasu after the Shinto sun goddess, this particle, as do all cosmic rays that strike the Earth's atmosphere, caused an air shower of electrons, protons, and other elementary particles to spray down onto the Earth below. In the featured illustration, a cosmic ray air shower is pictured striking the Telescope Array in UtahUSA, which recorded the Amaterasu event in 2021 May. Cosmic ray air showers are common enough that you likely have been in a particle spray yourself, although you likely wouldn't have noticed. The origin of this energetic particle, likely the nucleus of an atom, remains a mystery in two ways. First, it is not known how any single particle or atomic nucleus can practically acquire so much energy, and second, attempts to trace the particle back to where it originated did not indicate any likely potential source.


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Re:NASA pics

Date Posted:24/11/2024 10:07 AMCopy HTML

DirtyDancer1957 Share to: Facebook Twitter MSN linkedin google yahoo #214
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Re:NASA pics

Date Posted:24/11/2024 1:34 AMCopy HTML

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Re:NASA pics

Date Posted:23/11/2024 9:58 AMCopy HTML

2024 November 23
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Interplanetary Earth
Image Credit: Cassini Imaging TeamSSIJPLESANASA & NASA / JHU Applied Physics Lab / Carnegie Inst. Washington

Explanation: In an interplanetary first, on July 19, 2013 Earth was photographed on the same day from two other worlds of the Solar System, innermost planet Mercury and ringed gas giant Saturn. Pictured on the left, Earth is the pale blue dot just below the rings of Saturn, as captured by the robotic Cassini spacecraft then orbiting the outermost gas giant. On that same day people across planet Earth snapped many of their own pictures of Saturn. On the right, the Earth-Moon system is seen against the dark background of space as captured by the sunward MESSENGER spacecraft, then in Mercury orbit. MESSENGER took its image as part of a search for small natural satellites of Mercury, moons that would be expected to be quite dim. In the MESSENGER image, the brighter Earth and Moon are both overexposed and shine brightly with reflected sunlight. Destined not to return to their home world, both Cassini and MESSENGER have since retired from their missions of Solar System exploration


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Re:NASA pics

Date Posted:22/11/2024 9:26 AMCopy HTML

2024 November 22
See Explanation.  Clicking on the picture will download
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The Medusa Nebula
Image Credit & CopyrightBruno Rota Sargi

Explanation: Braided and serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation. The planetary nebula phase represents a final stage in the evolution of low mass stars like the sun as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers. Ultraviolet radiation from the hot star powers the nebular glow. The Medusa's transforming star is the faint one near the center of the overall bright crescent shape. In this deep telescopic view, fainter filaments clearly extend below and to the left. The Medusa Nebula is estimated to be over 4 light-years across.


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Re:NASA pics

Date Posted:21/11/2024 2:56 PMCopy HTML

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Re:NASA pics

Date Posted:21/11/2024 9:32 AMCopy HTML

2024 November 21
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The Elephant's Trunk in Cepheus
Image Credit: Image Credit & CopyrightGiorgio Ferrari

Explanation: Like an illustration in a galactic Just So Story, the Elephant's Trunk Nebula winds through the emission region and young star cluster complex IC 1396, in the high and far off constellation of Cepheus. Also known as vdB 142, this cosmic elephant's trunk is over 20 light-years long. The detailed telescopic view features the bright swept-back ridges and pockets of cool interstellar dust and gas that abound in the region. But the dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within. Nearly 3,000 light-years distant, the relatively faint IC 1396 complex covers a large region on the sky, spanning over 5 degrees. This rendition spans a 1 degree wide field of view though, about the angular size of 2 full moons.


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Re:NASA pics

Date Posted:20/11/2024 12:39 PMCopy HTML

2024 November 20
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Earthset from Orion
Image Credit: NASAArtemis 1

Explanation: Eight billion people are about to disappear in this snapshot from space taken on 2022 November 21. On the sixth day of the Artemis I mission, their home world is setting behind the Moon's bright edge as viewed by an external camera on the outbound Orion spacecraft. Orion was headed for a powered flyby that took it to within 130 kilometers of the lunar surface. Velocity gained in the flyby maneuver was used to reach a distant retrograde orbit around the Moon. That orbit is considered distant because it's another 92,000 kilometers beyond the Moon, and retrograde because the spacecraft orbited in the opposite direction of the Moon's orbit around planet Earth. Orion entered its distant retrograde orbit on November 25. Swinging around the Moon, Orion reached a maximum distance (just over 400,000 kilometers) from Earth on November 28, exceeding a record set by Apollo 13 for most distant spacecraft designed for human space explorationThe Artemis II mission, carrying 4 astronauts around the moon and back again, is scheduled to launch no earlier than September 2025.


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Re:NASA pics

Date Posted:19/11/2024 9:40 AMCopy HTML

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Re:NASA pics

Date Posted:18/11/2024 8:38 AMCopy HTML

2024 November 18
A blue glowing gas background shows numerous bright stars
in the foreground. A dark red dust nebula is also visible toward
the image center. Around the edges, dark dust clouds are also
visible, sometime colored tan and other times dark brown. 
Please see the explanation for more detailed information.

Stars and Dust in the Pacman Nebula
Image Credit & Copyright: Malcolm Loro

Explanation: Stars can create huge and intricate dust sculptures from the dense and dark molecular clouds from which they are born. The tools the stars use to carve their detailed works are high energy light and fast stellar winds. The heat they generate evaporates the dark molecular dust as well as causing ambient hydrogen gas to disperse and glowPictured here, a new open cluster of stars designated IC 1590 is nearing completion around the intricate interstellar dust structures in the emission nebula NGC 281, dubbed the Pac-man Nebula because of its overall shape. The dust cloud just above center is classified as a Bok Globule as it may gravitationally collapse and form a star -- or stars. The Pacman Nebula lies about 10,000 light years away toward the constellation of Cassiopeia.


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Re:NASA pics

Date Posted:17/11/2024 2:07 PMCopy HTML

2024 November 17
A starfield is dominated by light brown dust. In the 
middle is a parabolic gas cloud opening toward the lower right.
A bright star is near the center at the apex of the parabolic
gas cloud. 
Please see the explanation for more detailed information.

LDN 1471: A Windblown Star Cavity
Image Credit: HubbleNASAESAProcessing & LicenseJudy Schmidt

Explanation: What is the cause of this unusual parabolic structure? This illuminated cavity, known as LDN 1471, was created by a newly forming star, seen as the bright source at the peak of the parabola. This protostar is experiencing a stellar outflow which is then interacting with the surrounding material in the Perseus Molecular Cloud, causing it to brighten. We see only one side of the cavity -- the other side is hidden by dark dust. The parabolic shape is caused by the widening of the stellar-wind blown cavity over time. Two additional structures can also be seen either side of the protostar; these are known as Herbig-Haro objects, again caused by the interaction of the outflow with the surrounding material. What causes the striations on the cavity walls, though, remains unknown. The featured image was taken by NASA and ESA’s Hubble Space Telescope after an original detection by the Spitzer Space Telescope.


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Re:NASA pics

Date Posted:17/11/2024 12:06 PMCopy HTML

cheers Rocky

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Re:NASA pics

Date Posted:17/11/2024 10:01 AMCopy HTML

Thanks Rocky x

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Re:NASA pics

Date Posted:15/11/2024 9:21 AMCopy HTML

2024 November 15
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Apollo 12 and Surveyor 3
Image Credit: NASAApollo 12Alan Bean - Stereo Image Copyright: Kevin Frank

Explanation: Put on your red/blue glasses and gaze across the western Ocean of Storms on the surface of the Moon. The 3D anaglyph features Apollo 12 astronaut Pete Conrad visiting the Surveyor 3 spacecraft in November of 1969. Surveyor 3 had landed at the site on the inside slope of a small crater about 2 1/2 years earlier in April of 1967. Visible on the horizon beyond the far crater wall, Apollo 12's Lunar Module Intrepid touched down less than 200 meters (650 feet) away, easy moonwalking distance from the robotic Surveyor spacecraft. This stereo image was carefully created from two separate pictures (AS12-48-7133, AS12-48-7134) captured on the lunar surface. They depict the scene from only slightly different viewpoints, approximating the separation between human eyes.


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Re:NASA pics

Date Posted:14/11/2024 10:54 AMCopy HTML

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IC 348 and Barnard 3
Image Credit & CopyrightAshraf Abu Sara

Explanation: A great nebulous region near bright star omicron Persei offers this study in cosmic contrasts. Captured in the telescopic frame the colorful complex of dust, gas, and stars spans about 3 degrees on the sky along the edge of the Perseus molecular cloud some 1000 light-years away. Surrounded by a bluish halo of dust reflected starlight, omicron Persei itself is just left of center. Immediately below it lies the intriguing young star cluster IC 348 recently explored by the James Webb Space Telescope. In silhouette against the diffuse reddish glow of hydrogen gas, dark and obscuring interstellar dust cloud Barnard 3 is at upper right. Of course the cosmic dust also tends to hide newly formed stars and young stellar objects or protostars from prying optical telescopes. At the Perseus molecular cloud's estimated distance, this field of view would span about 50 light-years.


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Re:NASA pics

Date Posted:13/11/2024 9:26 AMCopy HTML

2024 November 13
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Barred Spiral Galaxy NGC 1365 from Webb
Image Credit: NASAESACSA, Janice Lee (NOIRLab) - Processing: Alyssa Pagan (STScI)

Explanation: A mere 56 million light-years distant toward the southern constellation Fornax, NGC 1365 is an enormous barred spiral galaxy about 200,000 light-years in diameter. That's twice the size of our own barred spiral Milky Way. This sharp image from the James Webb Space Telescope's Mid-Infrared Instrument (MIRI) reveals stunning details of this magnificent spiral in infrared light. Webb's field of view stretches about 60,000 light-years across NGC 1365, exploring the galaxy's core and bright newborn star clusters. The intricate network of dusty filaments and bubbles is created by young stars along spiral arms winding from the galaxy's central bar. Astronomers suspect the gravity field of NGC 1365's bar plays a crucial role in the galaxy's evolution, funneling gas and dust into a star-forming maelstrom and ultimately feeding material into the active galaxy's central, supermassive black hole.


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Re:NASA pics

Date Posted:13/11/2024 7:15 AMCopy HTML

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Re:NASA pics

Date Posted:12/11/2024 9:05 AMCopy HTML

2024 November 12
A starfield is shown with a unusual textured nebula
in the center colored in brown with blue trimmings. Diffuse
red nebula appear around the edges. In the center is an
opaque brown object. 
Please see the explanation for more detailed information.

NGC 6888: The Crescent Nebula
Image Credit & Copyright: Team ARO

Explanation: How was the Crescent Nebula created? Looking like an emerging space cocoon, the Crescent Nebula, visible in the center of the featured image, was created by the brightest star in its center. A leading progenitor hypothesis has the Crescent Nebula beginning to form about 250,000 years ago. At that time, the massive central star had evolved to become a Wolf-Rayet star (WR 136), shedding its outer envelope in a strong stellar wind, ejecting the equivalent of our Sun's mass every 10,000 years. This wind impacted surrounding gas left over from a previous phase, compacting it into a series of complex shells, and lighting it up. The Crescent Nebula, also known as NGC 6888, lies about 4,700 light-years away in the constellation of Cygnus. Star WR 136 will probably undergo a supernova explosion sometime in the next million years.


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Re:NASA pics

Date Posted:11/11/2024 10:03 PMCopy HTML

ROCKY

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Re:NASA pics

Date Posted:11/11/2024 9:10 AMCopy HTML

2024 November 11
A starfield is shown that includes a bright comet.
A bright tail points to the upper right but has an
unusual dark streak in it. A thin anti-tail points
toward the lower left. 
Please see the explanation for more detailed information.

The Unusual Tails of Comet Tsuchinshan-Atlas
Image Credit & Copyright: Bray Falls

Explanation: What created an unusual dark streak in Comet Tsuchinshan-Atlas's tail? Some images of the bright comet during mid-October not only caught its impressively long tail and its thin anti-tail, but a rather unexpected feature: a dark streak in the long tail. The reason for the dark streak is currently unclear and a topic of some debate. Possible reasons include a plume of dark dust, different parts of the bright tail being unusually superposed, and a shadow of a dense part of the coma on smaller dust particles. The streak is visible in the featured image taken on October 14 from Texas, USA. To help future analyses, if you have taken a good image of the comet that clearly shows this dark streak, please send it in to APOD. Comet Tsuchinshan–ATLAS has now faded considerably and is returning to the outer Solar System


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Re:NASA pics

Date Posted:11/11/2024 8:45 AMCopy HTML

That looks like a candle 

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Re:NASA pics

Date Posted:10/11/2024 9:53 AMCopy HTML

2024 November 10
A picture of Mars is shown as a large orange globe.
Across the center of the planet a long canyon is visible. 
Please see the explanation for more detailed information.

Valles Marineris: The Grand Canyon of Mars
Image Credit: NASAUSGSViking Project

Explanation: The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep. The origin of the Valles Marineris remains unknown, although a leading hypothesis holds that it started as a crack billions of years ago as the planet cooled. Several geologic processes have been identified in the canyon. The featured mosaic was created from over 100 images of Mars taken by Viking Orbiters in the 1970s.


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Re:NASA pics

Date Posted:09/11/2024 9:55 AMCopy HTML

2024 November 9
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Neptune at Night
Image Credit & Copyright: Voyager 2, NASA

Explanation: Ice giant Neptune is faint in Earth's night sky. Some 30 times farther from the Sun than our fair planet, telescopes are needed to catch a glimpse of the dim and distant world. This dramatic view of Neptune's night just isn't possible for telescopes in the vicinity of planet Earth though. Peering out from the inner Solar System they can only bring Neptune's day side into view. In fact this night side image with Neptune's slender crescent next to the crescent of its large moon Triton was captured by Voyager 2. Launched from planet Earth in 1977 the Voyager 2 spacecraft made a close fly by of the Solar System's outermost planet in 1989, looking back on Neptune as the robotic spacecraft continued its voyage to interstellar space.


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Re:NASA pics

Date Posted:07/11/2024 1:09 PMCopy HTML

Amazing pic 

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Re:NASA pics

Date Posted:07/11/2024 10:16 AMCopy HTML

2024 November 7
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Shell Galaxies in Pisces
Image Credit & Copyright: George Williams

Explanation: This spectacular intergalactic skyscape features Arp 227, a curious system of galaxies from the 1966 Atlas of Peculiar Galaxies. Some 100 million light-years distant within the boundaries of the constellation Pisces, Arp 227 consists of the two galaxies prominent above and left of center, the shell galaxy NGC 474 and its blue, spiral-armed neighbor NGC 470. The readily apparent shells and star streams of NGC 474 are likely tidal features originating from the accretion of another smaller galaxy during close gravitational encounters that began over a billion years ago. The large galaxy on the bottom righthand side of the deep image, NGC 467, appears to be surrounded by faint shells and streams too, evidence of another merging galaxy system. Intriguing background galaxies are scattered around the field that also includes spiky foreground stars. Of course, those stars lie well within our own Milky Way Galaxy. The telescopic field of view spans 25 arc minutes or just under 1/2 degree on the sky.


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Re:NASA pics

Date Posted:06/11/2024 12:07 PMCopy HTML

2024 November 6
A town is shown in the foreground surrounded by tall
mountains with even taller mountains in the distance. Above 
them all is a bright white streak that is a comet with both
a tail and an anti-tail. High above are stars in the night
sky.
Please see the explanation for more detailed information.

Comet Tsuchinshan-Atlas over the Dolomites
Credit & Copyright: Alessandra Masi

Explanation: Comet Tsuchinshan-Atlas is now headed back to the outer Solar System. The massive dusty snowball put on quite a show during its trip near the Sun, resulting in many impressive pictures from planet Earth during October. The featured image was taken in mid-October and shows a defining visual feature of the comet -- its impressive anti-tail. The image captures Comet C/2023 A3 (Tsuchinshan–ATLAS) with impressively long dust and ion tails pointing up and away from the Sun, while the strong anti-tail -- composed of more massive dust particles -- trails the comet and points down and (nearly) toward the recently-set Sun. In the foreground is village of Tai di CadoreItaly, with the tremendous Dolomite Mountains in the background. Another comet, C/2024 S1 (ATLAS), once a candidate to rival Comet Tsuchinshan-Atlas in brightness, broke up last week during its close approach to our Sun


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Re:NASA pics

Date Posted:02/11/2024 9:42 AMCopy HTML

Beautiful

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Re:NASA pics

Date Posted:01/11/2024 9:43 AMCopy HTML

2024 November 1
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Spiral Galaxy NGC 6744
Image Credit & CopyrightJohn Hayes

Explanation: Big, beautiful spiral galaxy NGC 6744 is nearly 175,000 light-years across, larger than our own Milky Way. It lies some 30 million light-years distant in the southern constellation Pavo but appears as only a faint smudge in the eyepiece of a small telescope. We see the disk of the nearby island universe tilted towards our line of sight in this remarkably deep and detailed galaxy portrait, a telescopic image that spans an area about the angular size of a full moon. In it, the giant galaxy's elongated yellowish core is dominated by the light from old, cool stars. Beyond the core, grand spiral arms are filled with young blue star clusters and speckled with pinkish star forming regions. An extended arm sweeps past smaller satellite galaxy NGC 6744A at the upper left. NGC 6744's galactic companion is reminiscent of the Milky Way's satellite galaxy the Large Magellanic Cloud.


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Re:NASA pics

Date Posted:31/10/2024 11:06 AMCopy HTML

2024 October 31
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Rigel and the Witch Head Nebula
Image Credit & CopyrightSimone Curzi

Explanation: By starlight, this eerie visage shines in the dark with a crooked profile evoking its popular name, the Witch Head Nebula. In fact, this entrancing telescopic portrait gives the impression that a witch has fixed her gaze on Orion's bright supergiant star Rigel. More formally known as IC 2118, the Witch Head Nebula spans about 50 light-years and is composed of interstellar dust grains reflecting Rigel's starlight. The color of the Witch Head Nebula is caused not only by Rigel's intense blue light, but because the dust grains scatter blue light more efficiently than red. The same physical process causes Earth's daytime sky to appear blue, although the scatterers in Earth's atmosphere are molecules of nitrogen and oxygen. Rigel and this dusty cosmic crone are about 800 light-years away. You may still see a few witches in your neighborhood tonight though, so have a safe and Happy Halloween!


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