Tag: Galaxy

• A Hubble Study of the Peculiar Asymmetry of NGC 949 by NASA Goddard Space Flight Center Via Flickr: This image provides the clearest ever view of galaxy NGC 949, which lies over 30 million light-years away in the constellation of Triangulum. The galaxy has an unusual shape, made more obscure due to its inclination. From our point of view, it is difficult to discern exactly what type of galaxy NGC 949 is, but it is certainly a disk galaxy of some kind, most likely a spiral. NGC 949 was first discovered by Sir William Herschel on September 21, 1786, using an 18.7-inch reflecting telescope. The galaxy was one of about 3,000 objects Herschel cataloged as “nebulae” during an intense and systematic deep sky survey, the results of which eventually formed the bulk of the New General Catalogue (NGC). Taken with Hubble’s Advanced Camera for Surveys (ACS), this image shows extraordinary detail. This detail allows us to see a strange asymmetric alignment in the dark lanes of dust that snake across the galaxy. The top-right half of the galaxy appears considerably more marbled with dust in this image; a curious observation explained by stars tending to favor locations towards the center of a galaxy, and dust preferring almost invariably to reside along the galactic plane. When a galaxy is inclined as NGC 949 is, some regions — in this case the top-right — are tipped toward us and the light from the stars we see in these regions has had to travel through more dust. This causes the light to appear redder — the result of the same process that gives the sun’s light a red hue at dusk — or else disappear entirely, making the dust appear more prominent on that side of the galaxy. In the part tipped away from us, the light from the stars has had to pass through much less dust to reach us, so it appears brighter, and the dust is much less prominent. Were it possible to view NGC 949 from the opposite side, the apparent alignment of the dust would be reversed. The scientific advantages of this effect were recently displayed in suitably stunning style in the M31 PHAT mosaic, which allowed astronomers to produce a partial three-dimensional dust map of M31 four times clearer than any previously attempted. Credit: ESA/Hubble & NASA NASA image use policy. NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Like us on Facebook Find us on Instagram

  2015-08-27

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• Hubble Catches Stellar Exodus in Action by NASA Goddard Space Flight Center Via Flickr: Using NASA’s Hubble Space Telescope, astronomers have captured for the first time snapshots of fledging white dwarf stars beginning their slow-paced, 40-million-year migration from the crowded center of an ancient star cluster to the less populated suburbs. White dwarfs are the burned-out relics of stars that rapidly lose mass, cool down and shut off their nuclear furnaces. As these glowing carcasses age and shed weight, their orbits begin to expand outward from the star cluster’s packed downtown. This migration is caused by a gravitational tussle among stars inside the cluster. Globular star clusters sort out stars according to their mass, governed by a gravitational billiard ball game where lower mass stars rob momentum from more massive stars. The result is that heavier stars slow down and sink to the cluster’s core, while lighter stars pick up speed and move across the cluster to the edge. This process is known as “mass segregation.” Until these Hubble observations, astronomers had never definitively seen the dynamical conveyor belt in action. Astronomers used Hubble to watch the white-dwarf exodus in the globular star cluster 47 Tucanae, a dense swarm of hundreds of thousands of stars in our Milky Way galaxy. The cluster resides 16,700 light-years away in the southern constellation Tucana. Read more: http://ift.tt/1PV0j7Y Credits: NASA, ESA, and H. Richer and J. Heyl (University of British Columbia, Vancouver, Canada); acknowledgement: J. Mack (STScI) and G. Piotto (University of Padova, Italy) NASA image use policy. NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Like us on Facebook Find us on Instagram

  2015-08-26

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• Hubble View: Wolf-Rayet Stars, Intense and Short-Lived by NASA Goddard Space Flight Center Via Flickr: This NASA/European Space Agency (ESA) Hubble Space Telescope picture shows a galaxy named SBS 1415+437 (also called SDSS CGB 12067.1), located about 45 million light-years from Earth. SBS 1415+437 is a Wolf-Rayet galaxy, a type of star-bursting galaxy with an unusually high number of extremely hot and massive stars known as Wolf-Rayet stars. These stars can be around 20 times as massive as the sun, but seem to be on a mission to shed surplus mass as quickly as possible — they blast substantial winds of particles out into space, causing them to dwindle at a rapid rate. A typical star of this type can lose a mass equal to that of our sun in just 100,000 years! These massive stars are also incredibly hot, with surface temperatures some 10 to 40 times that of the sun, and very luminous, glowing at tens of thousands to several million times the brightness of the sun. Many of the brightest and most massive stars in the Milky Way are Wolf-Rayet stars. Because these stars are so intense they do not last very long, burning up their fuel and blasting their bulk out into the cosmos on very short timescale — only a few hundred thousand years. Because of this it is unusual to find more than a few of these stars per galaxy — except in Wolf-Rayet galaxies, like the one in this image. Credit: ESA/Hubble & NASA NASA image use policy. NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Like us on Facebook Find us on Instagram Credit: NOAA/NASA GOES Project

  2015-08-26

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• Hubble peeks at a spiral galaxy by NASA Goddard Space Flight Center Via Flickr: This little-known galaxy, officially named J04542829-6625280, but most often referred to as LEDA 89996, is a classic example of a spiral galaxy. The galaxy is much like our own galaxy, the Milky Way. The disk-shaped galaxy is seen face on, revealing the winding structure of the spiral arms. Dark patches in these spiral arms are in fact dust and gas — the raw materials for new stars. The many young stars that form in these regions make the spiral arms appear bright and bluish. The galaxy sits in a vibrant area of the night sky within the constellation of Dorado (The Swordfish), and appears very close to the Large Magellanic Cloud — one of the satellite galaxies of the Milky Way. The observations were carried out with the high resolution channel of Hubble’s Advanced Camera for Surveys. Image credit: ESA/Hubble & NASA, Acknowledgement: Flickr user C. Claude NASA image use policy. NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Like us on Facebook Find us on Instagram

  2015-08-26

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• Hubble Uncovering the Secrets of the Quintuplet Cluster by NASA Goddard Space Flight Center Via Flickr: Although this cluster of stars gained its name due to its five brightest stars, it is home to hundreds more. The huge number of massive young stars in the cluster is clearly captured in this NASA/ESA Hubble Space Telescope image. The cluster is located close to the Arches Cluster and is just 100 light-years from the center of our galaxy. The cluster’s proximity to the dust at the center of the galaxy means that much of its visible light is blocked, which helped to keep the cluster unknown until its discovery in 1990, when it was revealed by infrared observations. Infrared images of the cluster, like the one shown here, allow us to see through the obscuring dust to the hot stars in the cluster. The Quintuplet Cluster hosts two extremely rare luminous blue variable stars: the Pistol Star and the lesser known V4650 Sgr. If you were to draw a line horizontally through the center of this image from left to right, you could see the Pistol Star hovering just above the line about one third of the way along it. The Pistol Star is one of the most luminous known stars in the Milky Way and takes its name from the shape of the Pistol Nebula that it illuminates, but which is not visible in this infrared image. The exact age and future of the Pistol Star are uncertain, but it is expected to end in a supernova or even a hypernova in one to three million years. The cluster also contains a number of red supergiants. These stars are among the largest in the galaxy and are burning their fuel at an incredible speed, meaning they will have a very short lifetime. Their presence suggests an average cluster age of nearly four million years. At the moment these stars are on the verge of exploding as supernovae. During their spectacular deaths they will release vast amounts of energy which, in turn, will heat the material — dust and gas — between the other stars. This observation shows the Quintuplet Cluster in the infrared and demonstrates the leap in Hubble’s performance since its 1999 image of same object. Credit: ESA/NASA NASA image use policy. NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Like us on Facebook Find us on Instagram

  2015-08-26

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• Serpentine Falls, Western Australia – Vertical Panorama by inefekt69 Via Flickr: Nikon d5100 f2.0 35mm 3200ISO 45 x 13 seconds stitched in PTGui This is a 45 shot vertical panorama using a 35mm prime lens (f1.8). The core was directly above my head which means this shot covers approximately 90 to 100 degrees. It’s the first time I’ve captured a panorama with this lens which results in quite a bit more detail in the core than the 11mm wide angle lens I normally use. I had been wanting to go out to the falls for a while but had to wait until we got some decent rain.

  2015-08-23

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• The Sky At Night by MsFungi Via Flickr: Taken last night (or the early hours) with my brother as he turned 16! It was such a perfect night and a gorgeous sky, the meteor shower was absolutely incredible! We are so lucky to have such a amazing view of the night sky from our home. Thanks for viewing ;)

  2015-08-20

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• Amazing things in all directions by World Traveller Photography Via Flickr: Enjoying the views from the edge of Kilauea’s caldera

  2015-08-19

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• Alone in the Universe – ‘Alone in the Universe’ This was taken at the Dutch Veluwe. Perseiden storms were predicted that night and the skies were very clear. It was a perfect night to do some Milky Way shooting. When I was taking some photos of my friend standing in front of the Milky Way, I noticed something in the sky. It looked like a star moving, but it was much slower. It turned out to be the white stripe you see in the image here. After research, it turns out that this is the ISS (International Space Station). I was extremely excited: a selfie with the Milky Way AND the ISS! How awesome is that? EXIF: Sony A7II, Samyang 14mm f2.8 @ 2.8, ISO 3200, 20 seconds. Single exposure If you like my work, please check out my website and Facebook: www.albertdros.com facebook: Albert Dros Photography by albert dros via http://flic.kr/p/we2nDW

  2015-08-16

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• Above the Valley… beneath the Stars… – by Edward Wolohan via http://flic.kr/p/wMRi27

  2015-08-12

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• Landscape Hunters 合歡山主峰 – Copyright © Vincent Ting Photography. All rights reserved. Please don’t use without my permission Welcome visit my Getty Images | 500px | Facebook | twitter by Vincent_Ting via http://flic.kr/p/wQY6ta

  2015-08-05

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• M31, the Andromeda Galaxy – The famous Andromeda Galaxy is the nearest large galaxy to our own Milky Way. It is so bright that under dark skies it is easily seen by naked eye as a fuzzy patch of light in the northern part of the constellation of Andromeda. Also seen in this photograph are M31’s companion galaxies M110 (below) and M32 (above). M31 is a gigantic collection of billions of stars estimated to be 2.5 million light years away. It has been observed since ancient times and was first catalogued by astronomers as long ago as 905 AD. by write_adam via http://flic.kr/p/L1VCf

  2015-08-04

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• M31, Andromeda Galaxy [explored] – You all know this one … Andromeda is the nearest large galaxy to the Milky Way (approx 2.5 million ly away), and similar to ours in size and structure. It’s huge – even at that distance it appears about 6 full moons across. M31 is so bright that it can be seen with the naked eye from dark skies, and I regularly catch it through binoculars even from downtown Toronto. She also has a couple of companion galaxies – M32 is the small one above it, and M110 is the elliptical one below it. All of the (non-galaxy) stars in this field are part of our Milky Way, and relatively nearby – positioned between us and the distant galaxies. Think of it as if you’re looking through snowflakes at a distant object. Details for astronerds: L:R:G:B combine (minutes) = 80:25:25:35 FSQ-85 and STL11000M Taken from dark skies near Havelock, Ontario, Canada on August 6, 2010. Thanks for looking, Adam by write_adam via http://flic.kr/p/8qki95

  2015-08-04

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• Selfie – Pointing at the Galactic center of the Milky Way over the town of Pylos in Messinia, Greece. © alexandrosmaragos.com | facebook | twitter by Alexandros Maragos via http://flic.kr/p/wN95oP

  2015-08-02

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