Tag: tumblr

• Hubble Peers at a Distinctly Disorganized Dwarf Galaxy Despite being less famous than their elliptical and spiral galactic cousins, irregular dwarf galaxies, such as the one captured in this NASA/ESA Hubble Space Telescope image, are actually one of the most common types of galaxy in the universe. Known as UGC 4459, this dwarf galaxy is located approximately 11 million light-years away in the constellation of Ursa Major (The Great Bear), a constellation that is also home to the Pinwheel Galaxy (M101), the Owl Nebula (M97), Messier 81, Messier 82 and several other galaxies all part of the M81 group. UGC 4459’s diffused and disorganized appearance is characteristic of an irregular dwarf galaxy. Lacking a distinctive structure or shape, irregular dwarf galaxies are often chaotic in appearance, with neither a nuclear bulge — a huge, tightly packed central group of stars — nor any trace of spiral arms — regions of stars extending from the center of the galaxy. Astronomers suspect that some irregular dwarf galaxies were once spiral or elliptical galaxies, but were later deformed by the gravitational pull of nearby objects. Rich with young blue stars and older red stars, UGC 4459 has a stellar population of several billion. Though seemingly impressive, this is small when compared to the 200 to 400 billion stars in the Milky Way! Observations with Hubble have shown that because of their low masses of dwarf galaxies like UGC 4459, star formation is very low compared to larger galaxies. Only very little of their original gas has been turned into stars. Thus, these small galaxies are interesting to study to better understand primordial environments and the star formation process. Image Credit: ESA/Hubble and NASA; Acknowledgement: Judy Schmidt #nasagoddard #space #hubble #space #galaxy by nasagoddard

  2016-04-01

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• meow_irl via /r/MEOW_IRL http://bit.ly/1SFq12f

  2016-04-01

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• Sun Rays as seen from Adam’s Peak, Sri Lanka. [OC] [4896X3672] via /r/SkyPorn http://bit.ly/1PKcZMg

  2016-04-01

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• Orion Spacecraft Suited Crew Testing via NASA http://go.nasa.gov/1RQ29Wq

  2016-04-01

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• meow_irl via /r/MEOW_IRL http://bit.ly/1q9v5TJ

  2016-04-01

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• Swiss Alps, between Adelboden and Kandersteg [OC][4096×2731] via /r/EarthPorn http://bit.ly/1SFgkAT

  2016-04-01

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• Tilted Terminator of Enceladus [597×597] via /r/spaceporn http://bit.ly/1pQCMNM

  2016-04-01

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• Dark Moons and Dark Rings of Saturn[597×597] via /r/spaceporn http://bit.ly/1M66AQS

  2016-04-01

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• Charon and Pluto: Strikingly Different Worlds [597×597] via /r/spaceporn http://bit.ly/1SF5ieY

  2016-04-01

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• Contrary to their name, the Badlands aren’t actually that bad [OC][1100×746] via /r/EarthPorn http://bit.ly/1PJZ4pI

  2016-04-01

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• 7,000 meters up, near the Chile/Argentina border [OC] [2736×3648] via /r/EarthPorn http://bit.ly/1RR1NlE

  2016-04-01

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• Path through the Jura mountains, Switzerland [OC][4591×3099] via /r/EarthPorn http://bit.ly/1VXS3sM

  2016-04-01

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• meow_irl via /r/MEOW_IRL http://bit.ly/1SEOXqL

  2016-04-01

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• 13.000 ft High – Amazing view at the Andes in Argentina [OC] [3655×1925] via /r/EarthPorn http://bit.ly/1X2n0ud

  2016-04-01

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