Wednesday, July 11, 2012

PENEMUAN GALAKSI "TRANSPARAN"

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Teleskop luar angkasa Hubble baru saja menemukan tiga galaksi yang saking tua dan samarnya diberi julukan 'Galaksi Transparan'. 
Tiga galaksi ini diperkirakan akan sangat membantu para antariksawan untuk menjelaskan misteri kosmos yang berusia 13 miliar tahun. 
Galaksi-galaksi ini termasuk yang terkecil dan nyaris tak terlihat dan paling dekat dengan Bima Sakti.

Gambar-gambar yang dirilis pada 10 Juli 2012 ini menunjukkan galaksi kerdil yang redup, Leo IV, tetangga dekat galaksi Bima Sakti.
Leo IV adalah satu dari belasan galaksi kerdil yang samar-samar di sekitar Bima Sakti. Galaksi ini didominasi oleh dark matter atau materi gelap, materi tak tampak yang merupakan sebagian besar massa semesta. Gambar oleh Sloan Digital Sky Survey menampilkan Leo IV dan kawasan di sekitarnya. 
Leo IV terletak 500 ribu tahun cahaya dari Bumi. Leo IV memiliki sedikit bintang, sekitar beberapa ribu, sehingga astronom sulit menggolongkannya sebagai galaksi. Bintang-bintang di galaksi ini berusia 13 miliar tahun, hampir setua alam semesta yang mencapai 13,7 miliar tahun.
http://l3.yimg.com/bt/api/res/1.2/JCnDzQgf34JBcjZWh9FzSQ--/YXBwaWQ9eW5ld3M7Zmk9aW5zZXQ7aD00MzI7cT04NTt3PTYzMA--/http://media.zenfs.com/en_us/News/Reuters/2012-07-10T220943Z_960543037_GM1E87B0GSV01_RTRMADP_3_SPACE-GALAXIES.JPG
REUTERS/NASA, ESA, and T. Brown (STScI)/Handout (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS

Gambar galaksi kerdil Leo IV seperti diambil oleh NASA/ESA Hubble Space Telescope, dan dikeluarkan NASA on July 10, 2012. 

Gambar di kiri menunjukkan galaksi kerdil tersebut, ditandai oleh kotak putih. Foto di tengah adalah gambar dekat latar galaksi Leo IV. Gambar di kanan adalah bintang-bintang di Leo IV.
http://l1.yimg.com/bt/api/res/1.2/y7yyUjVL3EZ6F7CwZVZuKg--/YXBwaWQ9eW5ld3M7Zmk9aW5zZXQ7aD00MDc7cT04NTt3PTYzMA--/http://media.zenfs.com/en_us/News/Reuters/2012-07-10T213713Z_1305795079_GM1E87B0EW801_RTRMADP_3_SPACE-GALAXIES.JPG
REUTERS/NASA, ESA, and T. Brown (STScI)/Handout (ENVIRONMENT SCIENCE TECHNOLOGY) FOR EDITORIAL USE ONLY.
NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS

Astronomers used the NASA/ESA Hubble Space Telescope to unmask the dim, star-starved dwarf galaxy Leo IV. This Hubble image released on July 10, 2012, demonstrates why astronomers had a tough time spotting this small-fry galaxy: it is practically invisible. 
The image shows how the handful of stars from the sparse galaxy are virtually indistinguishable from the background. Residing 500 000 light-years from Earth, Leo IV is one of more than a dozen ultra-faint dwarf galaxies found lurking around our Milky Way galaxy. These galaxies are dominated by dark matter, an invisible substance that makes up the bulk of the Universe's mass.

http://l2.yimg.com/bt/api/res/1.2/FTlHge92BcHzdwGwdu638A--/YXBwaWQ9eW5ld3M7Zmk9aW5zZXQ7aD02NDA7cT04NTt3PTYzMA--/http://media.zenfs.com/en_us/News/Reuters/2012-07-10T221043Z_1724116938_GM1E87B0GSY01_RTRMADP_3_SPACE-GALAXIES.JPG
REUTERS/NASA, ESA, and T. Brown (STScI)/Handout (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) FOR EDITORIAL USE ONLY.
NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.
THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS

The wide image shows dwarf galaxy Leo IV and the surrounding neighbourhood. The dotted line marks the galaxy’s boundaries, measuring about 1100 light-years wide. The small white box outlines the Hubble Space Telescope’s view.

Dwarf galaxy Leo IV is hard to spot (left). A close-up view of the background galaxies within the box is shown in the middle image. The image at right shows only the stars in Leo IV. Image released July 10, 2012.

The Muñoz 1 globular cluster is seen to the right of the Ursa Minor dwarf galaxy in this image from the Canada-France-Hawaii Telescope MegaCam imager.
http://l.yimg.com/bt/api/res/1.2/IllVrJxgMqKjHhmKCox1kw--/YXBwaWQ9eW5ld3M7Zmk9aW5zZXQ7aD00MzU7cT04NTt3PTU3NQ--/http://media.zenfs.com/en_US/News/SPACE.com/Faintest_Star_Cluster_Yet_Discovered-851500971de26384faf4c21418a99a28



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