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exploring.space This composite image shows the distribution of dark matter, galaxies, and hot gas in the core of the merging galaxy cluster Abell 520, formed from a violent collision of massive galaxy clusters.

Superimposed on the natural-color image are maps showing the concentration of starlight, hot gas, and dark matter. Starlight from galaxies is colored orange. The green-tinted regions show hot gas. The gas is evidence that a collision took place. The blue-colored areas pinpoint the location of most of the mass in the cluster, which is dominated by dark matter. Dark matter is an invisible substance that makes up most of the universe's mass. The dark-matter map was derived by detecting how light from distant objects is distorted by the cluster of galaxies, an effect called gravitational lensing.

The blend of blue and green in the center of the image reveals that a clump of dark matter resides near most of the hot gas, where very few galaxies are found. This finding confirms previous observations of a dark-matter core in the cluster. The result could present a challenge to basic theories of dark matter, which predict that galaxies should be anchored to dark matter, even during the shock of a collision. Abell 520 resides 2.4 billion light-years away.

Credit: NASA, ESA, CFHT, CXO, M.J. Jee (University of California, Davis), and A. Mahdavi (San Francisco State University)

#NASA #Hubble #Space #Exploring #Universe #Sky #OuterSpace #Cosmos #Galactic #Nature #Creation #Far #Amazing #Beautiful #Science #Astronomy #Astronomical #Astrophysics #Celestial #Love #Merging #Galaxy #Cluster #Abell520 #2400000000ly #DarkMatter #Gravitational #Lensing #Collision
40min

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oddie1028 #Repost @nasa
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Clues that May Help Identify Dark Matter: Using observations from NASA’s Hubble Space Telescope and Chandra X-ray Observatory, astronomers have found that dark matter does not slow down when colliding with itself, meaning it interacts with itself less than previously thought. Researchers say this finding narrows down the options for what this mysterious substance might be. Dark matter is an invisible matter that makes up most of the mass of the universe. Because dark matter does not reflect, absorb or emit light, it can only be traced indirectly by, such as by measuring how it warps space through gravitational lensing, during which the light from a distant source is magnified and distorted by the gravity of dark matter.

Here are images of four different galaxy clusters taken with Hubble (blue) and Chandra (pink) in a study of how dark matter in clusters of galaxies behaves when the clusters collide. A total of 72 large cluster collisions were studied.

Image Credit: NASA and ESA

#nasa #space #chandra #hubble #hst #hubble25 #astronomy #darkmatter #science
41min

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timeless_universe Celestial Radiance

Image credit & Copyright: Chris Wiewiora

How can space travel faster than the speed of light? p.1

Cosmologists are intellectual time travelers. Looking back over billions of years, these scientists are able to trace the evolution of our Universe in astonishing detail. 13.8 billion years ago, the Big Bang occurred. Fractions of a second later, the fledgling Universe expanded exponentially during an incredibly brief period of time called inflation. Over the ensuing eons, our cosmos has grown to such an enormous size that we can no longer see the other side of it.

But how can this be? If light's velocity marks a cosmic speed limit, how can there possibly be regions of spacetime whose photons are forever out of our reach? And even if there are, how do we know that they exist at all?

The Expanding Universe

Like everything else in physics, our Universe strives to exist in the lowest possible energy state possible. But around 10-36 seconds after the Big Bang, inflationary cosmologists believe that the cosmos found itself resting instead at a "false vacuum energy" – a low-point that wasn't really a low-point. Seeking the true nadir of vacuum energy, over a minute fraction of a moment, the Universe is thought to have ballooned by a factor of 1050. Since that time, our Universe has continued to expand, but at a much slower pace. We see evidence of this expansion in the light from distant objects. As photons emitted by a star or galaxy propagate across the Universe, the stretching of space causes them to lose energy. Once the photons reach us, their wavelengths have been redshifted in accordance with the distance they have traveled.This is why cosmologists speak of redshift as a function of distance in both space and time. The light from these distant objects has been traveling for so long that, when we finally see it, we are seeing the objects as they were billions of years ago.
42min

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yourdailyuniverse Spiral Galaxy M83: The Southern Pinwheel.

Explanation: M83 is one of the closest and brightest spiral galaxies on the sky. Visible with binoculars in the constellation of Hydra, majestic spiral arms have prompted its nickname as the Southern Pinwheel. Although discovered 250 years ago, only much later was it appreciated that M83 was not a nearby gas cloud, but a barred spiral galaxy much like our own Milky Way Galaxy. M83, pictured above by the Hubble Space Telescope in a recently released image, is a prominent member of a group of galaxies that includes Centaurus A and NGC 5253, all of which lie about 15 million light years distant. Several bright supernova explosions have been recorded in M83. An intriguing double circumnuclear ring has been discovered at the center of of M83.

Image Credit: NASA, ESA, Hubble Heritage Team (STScI/AURA), and W. P. Blair (JHU) et al.
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#timelessuniverse #universe #instacool #instalike #instadaily #planet #picoftheday #art #apod #alien #astro #amazing #astronaut #astronomy #astrophotography #sun #star #space #stars #science #food #galaxy #hubble #love #cosmos #colorful #NASA #night #nature #moon
48min

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born.astronomer This new Hubble image, captured and released to celebrate the telescope’s 23rd year in orbit, shows part of the sky in the constellation of Orion (The Hunter). Rising like a giant seahorse from turbulent waves of dust and gas is the Horsehead Nebula, otherwise known as Barnard 33.

This image shows the region in infrared light, which has longer wavelengths than visible light and can pierce through the dusty material that usually obscures the nebula’s inner regions. The result is a rather ethereal and fragile-looking structure, made of delicate folds of gas — very different to the nebula’s appearance in visible light.
#neildegrasstyson #billnye #stephenhawking #cosmos #shipoftheimagination #sciencerules #galaxy #stars #universe #theoreticalphysicist #planets #solarsystem #bigbang #astronomy #starporn #scienceporn #astrophysicist #nasa #orbit #stargazing #secular #cosmology #andromedagalaxy #hubble #telescope #constellation #orion #mars #interstellar #outerspace
2h

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born.astronomer With a magnitude of 7.5 , the Dumbbell Nebula is the faintest object in our Top-10 list. It is however the second largest planetary nebula in the northern sky and can be found relatively easily. The Dumbbell Nebula is located in the constellation Vulpecula, Latin for “Little Fox”. Vulpecula is a very small constellation with faint stars, southwest of Albireo in the constellation Cygnus. My preferred way to find M27 is with the help of the constellation Sagitta, the “Arrow”, just south of it. Its stars are brighter so they are easier to make out. They are shaped like an arrow with feathers (or a triangle  with tip). The Dumbbel Nebula, M27 is pretty exactly north of Sagitta’s tip star, Gamma Saggitae.
#neildegrasstyson #billnye #stephenhawking #cosmos #shipoftheimagination #sciencerules #galaxy #stars #universe #theoreticalphysicist #planets #solarsystem #bigbang #astronomy #starporn #scienceporn #astrophysicist #nasa #orbit #stargazing #secular #cosmology #andromedagalaxy #hubble #telescope #constellation #orion #mars #interstellar #outerspace
2h

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sospiro38 You never fail to amaze me, Universe I you. #Hubble #Ultra #Deep #Field 3h

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powwowtaiwan #Repost via @nasa. On our human endevour to understand the Universe and ourselves

Clues that May Help Identify Dark Matter: Using observations from NASA’s Hubble Space Telescope and Chandra X-ray Observatory, astronomers have found that dark matter does not slow down when colliding with itself, meaning it interacts with itself less than previously thought. Researchers say this finding narrows down the options for what this mysterious substance might be. Dark matter is an invisible matter that makes up most of the mass of the universe. Because dark matter does not reflect, absorb or emit light, it can only be traced indirectly by, such as by measuring how it warps space through gravitational lensing, during which the light from a distant source is magnified and distorted by the gravity of dark matter.

Here are images of four different galaxy clusters taken with Hubble (blue) and Chandra (pink) in a study of how dark matter in clusters of galaxies behaves when the clusters collide. A total of 72 large cluster collisions were studied.

Image Credit: NASA and ESA

#nasa #space #chandra #hubble #hst #hubble25 #astronomy #darkmatter #science
3h

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lunarworkshops Gas from a dying star resembles a butterfly, its lacy wings formed by the ejection of its outer layers. #Hubble @natgeo #outerspace 4h

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lunarworkshops A peek inside a cavern of roiling dust and gas in the Great Orin Nebula @natgeo #hubble #outerspace 4h

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exploring.space The Horsehead Nebula
*check previous post for full details*

This video presents a scientific visualization of the Horsehead Nebula as seen in infrared light. To fill out the widescreen frame, the central Hubble image has been augmented by ground-based observations from the European Southern Observatory's Visible and Infrared Survey Telescope for Astronomy (VISTA). The three-dimensional interpretation has been sculpted to create a wispy and mountainous environment, with stars distributed in an approximate and statistical manner. The computer graphics model is intended to be scientifically reasonable, but not fully accurate. This imaginative traverse of the glowing gaseous landscape provides an inspiring spaceflight experience that brings the celestial scene to life.

Credit: NASA, ESA, and G. Bacon, T. Davis, L. Frattare, Z. Levay, and F. Summers (Viz 3D Team, STScI)

#NASA #Hubble #Space #Exploring #Universe #Sky #OuterSpace #Cosmos #Galactic #Nature #Creation #Far #Amazing #Beautiful #Science #Astronomy #Astronomical #Astrophysics #Celestial #Love #Horsehead #Nebula #Infrared #Orion #M42 #1500ly #Interstellar #Video
4h

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exploring.space The Horsehead Nebula

Looking like an apparition rising from whitecaps of interstellar foam, the iconic Horsehead Nebula has graced astronomy books ever since its discovery over a century ago. The nebula is a favorite target for amateur and professional astronomers.

In this picture the nebula appears in a new light, as seen in infrared wavelengths. The nebula, shadowy in optical light, appears transparent and ethereal when seen in the infrared, represented here with visible shades. The rich tapestry of the Horsehead Nebula pops out against the backdrop of Milky Way stars and distant galaxies that are easily seen in infrared light.

The backlit wisps along the Horsehead's upper ridge are being illuminated by Sigma Orionis, a young five-star system just off the top of the Hubble image. A harsh ultraviolet glare from one of these bright stars is slowly evaporating the nebula. Along the nebula's top ridge, two fledgling stars peek out from their now-exposed nurseries.

Gas clouds surrounding the Horsehead have already dissipated, but the tip of the jutting pillar contains a slightly higher density of hydrogen and helium, laced with dust. This casts a shadow that protects material behind it from being photo-evaporated, and a pillar structure forms. Astronomers estimate that the Horsehead formation has about five million years left before it too disintegrates.

The Horsehead Nebula is part of a much larger complex in the constellation Orion. Known collectively as the Orion Molecular Cloud, it also houses other famous objects such as the Great Orion Nebula (M42), the Flame Nebula, and Barnard's Loop. At about 1,500 light-years away, this complex is one of the nearest and most easily photographed regions in which massive stars are being formed.

Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

#NASA #Hubble #Space #Exploring #Universe #Sky #OuterSpace #Cosmos #Galactic #Nature #Creation #Far #Amazing #Beautiful #Science #Astronomy #Astronomical #Astrophysics #Celestial #Love #Horsehead #Nebula #Infrared #Orion #M42 #1500ly #Interstellar
4h

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Normal Cosmology/Astrophysics🔭
astrophysics_ One type of multiverse that I haven't discussed yet is the many worlds interpretation of quantum mechanics. In a nutshell, every possible alternate history and future are real. The hypothesis basically states that there is a very large, perhaps infinite, number of universes, and everything that could possibly have happened in our past, but did not, has occurred in the past of some other universe or universes. To get an idea of this hypothesis, I'll give the example of Schrödinger's cat.
Here is the actual quote from Schrödinger describing the thought experiment: "One can even set up quite ridiculous cases. A cat is penned up in a steel chamber, along with the following device (which must be secured against direct interference by the cat): in a Geiger counter, there is a tiny bit of radioactive substance, so small, that perhaps in the course of the hour one of the atoms decays, but also, with equal probability, perhaps none; if it happens, the counter tube discharges and through a relay releases a hammer that shatters a small flask of hydrocyanic acid. If one has left this entire system to itself for an hour, one would say that the cat still lives if meanwhile no atom has decayed. The psi-function of the entire system would express this by having in it the living and dead cat (pardon the expression) mixed or smeared out in equal parts." In this interpretation, every event is a branch point; the cat is both alive and dead, even before the box is opened, but the "alive" and "dead" cats are in different branches of the universe, both of which are equally real, but which do not interact with each other.
#astronomy #astronomer #space #cosmos #cosmology #astrobiology #astrophysics #interstellar #outerspace #universe #multiverse #galaxy #stars #planets #nebula #supernova #comet #asteroid #astronaut #rocket #spacetravel #stargazing #starstuff #Nasa #Hubble #telescope #science #physics #stringtheory #Mtheory
4h

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nasachandraxray Eta Carinae: New View of Doomed Star
This composite image of Eta Carinae from NASA's Chandra X-ray Observatory and Hubble Space Telescope shows the remnants of a massive eruption from the star during the 1840s. The X-ray data (yellow) show where material from that explosion has collided with nearby gas and dust. The optical data (blue) reveals material ejected from the star has formed a bipolar structure. Chandra detects a faint X-ray reflection off the inner optical nebula due to the collision of stellar winds between Eta Carinae and a suspected companion star. (Credit: X-ray: NASA/CXC/GSFC/M.Corcoran et al.; Optical: NASA/STScI)
http://chandra.si.edu/photo/2007/etacar/

#nasa #chandra #chandraxray #nasachandraxray #chandraxrayobservatory #CXC #smithsonian #xray #universe #cosmos #space #science #astronomy #astrophysics #astrogram #spacegram #NASAgram #learn #wow #etacarinae #hubble #HST #optical #nebula #supernova #supernovaremnant #star
4h

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evren.galaksi.uzay Hubble Uzay Teleskobu(HUT) 1990 yılında fırlatılan teleskop bugün uzay hakkında çok geniş bilgiler edinmemizi sağlamıştır. Yerdeki teleskoplara nazaran atmosfer kırılmalarından etkilenmeden, evren üzerindeki en kaliteli merceklerle insanlığa hizmet vermektedir. 3d

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oscarvillanueva104 #Repost @nasa
・・・
Clues that May Help Identify Dark Matter: Using observations from NASA’s Hubble Space Telescope and Chandra X-ray Observatory, astronomers have found that dark matter does not slow down when colliding with itself, meaning it interacts with itself less than previously thought. Researchers say this finding narrows down the options for what this mysterious substance might be. Dark matter is an invisible matter that makes up most of the mass of the universe. Because dark matter does not reflect, absorb or emit light, it can only be traced indirectly by, such as by measuring how it warps space through gravitational lensing, during which the light from a distant source is magnified and distorted by the gravity of dark matter.

Here are images of four different galaxy clusters taken with Hubble (blue) and Chandra (pink) in a study of how dark matter in clusters of galaxies behaves when the clusters collide. A total of 72 large cluster collisions were studied.

Image Credit: NASA and ESA

#nasa #space #chandra #hubble #hst #hubble25 #astronomy #darkmatter #science
4h

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