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5:11 PM Paris - Scientists have discovered a large hole that sucks in the heart of our galaxy's gravity.
Various observations are entrancing, which will be broadcast later this month, offers the best evidence so far that a number of giant-sized black holes - the most influential force in the universe and confusing, really exists.
By tracking the orbits of 28 stars in our Milky Way for more than 16 years, scientists in Germany to follow the most detailed portrait ever available on a variety of monsters not seen this.
Black holes are believed to be the scientists concentrated gravitational field is so strong, so that any object, including light can not escape from hisapannya.
The only way to feel their presence is to examine the impact of the black hole of celestial objects that are nearby.
This black hole known as Sagittarius A-star
"Orbits of stars in the galaxy center show that the large central mass concentration emat million solar mass black hole and it must have been, no doubt," says Reinhard Genzel of the Earth Institute of Physics Outer Max Planck near Munich, Germany, in a statement.
A "mass of the sun" is equal to the mass of our sun.
The researchers are also able to calculate with precision the greater the distance between Earth and the galaxy center, which is 27,000 light years.
A light year is the distance light travels in a year, or about 10 trillion kilometers.
Unique laboratory
"The galaxy center is a unique laboratory, temnpat we can examine some of the basic processes of strong gravity, stellar dynamics and star formation," said Genzel told DPA.
Sagittarius A gives us the most detailed view ever we get on very large black hole because of its proximity to Earth, he said.
Interstellar dust that fill the blocks Galaxy blocking our direct view of the Milky Way's central region in visible light. So astronomers have to use infrared wavelengths to penetrate the dust.
The position of the stars were measured with a precision six times greater than previous studies, the equivalent of seeing a coin from a distance of about 10,000 kilometers.
Various observations made using a camera SHARP at the New Technology Telescope of the European Southern Observatory (ESO) in Chile and the Very Large Telescope equipment at ESO. (*)
Sumber: http://id.shvoong.com/humanities/1764634-galaksi-bimasakti-terancam-ditabrak-awan/#ixzz1N7WFDHY1
Tampilkan postingan dengan label galaksi kita. Tampilkan semua postingan
Tampilkan postingan dengan label galaksi kita. Tampilkan semua postingan
Senin, 13 Juni 2011
Milky Way's central black hole that is gaping
5:11 PM Paris - Scientists have discovered a large hole that sucks in the heart of our galaxy's gravity.
Various observations are entrancing, which will be broadcast later this month, offers the best evidence so far that a number of giant-sized black holes - the most influential force in the universe and confusing, really exists.
By tracking the orbits of 28 stars in our Milky Way for more than 16 years, scientists in Germany to follow the most detailed portrait ever available on a variety of monsters not seen this.
Black holes are believed to be the scientists concentrated gravitational field is so strong, so that any object, including light can not escape from hisapannya.
The only way to feel their presence is to examine the impact of the black hole of celestial objects that are nearby.
This black hole known as Sagittarius A-star
"Orbits of stars in the galaxy center show that the large central mass concentration emat million solar mass black hole and it must have been, no doubt," says Reinhard Genzel of the Earth Institute of Physics Outer Max Planck near Munich, Germany, in a statement.
A "mass of the sun" is equal to the mass of our sun.
The researchers are also able to calculate with precision the greater the distance between Earth and the galaxy center, which is 27,000 light years.
A light year is the distance light travels in a year, or about 10 trillion kilometers.
Unique laboratory
"The galaxy center is a unique laboratory, temnpat we can examine some of the basic processes of strong gravity, stellar dynamics and star formation," said Genzel told DPA.
Sagittarius A gives us the most detailed view ever we get on very large black hole because of its proximity to Earth, he said.
Interstellar dust that fill the blocks Galaxy blocking our direct view of the Milky Way's central region in visible light. So astronomers have to use infrared wavelengths to penetrate the dust.
The position of the stars were measured with a precision six times greater than previous studies, the equivalent of seeing a coin from a distance of about 10,000 kilometers.
Various observations made using a camera SHARP at the New Technology Telescope of the European Southern Observatory (ESO) in Chile and the Very Large Telescope equipment at ESO. (*)
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Rabu, 01 Juni 2011
Galaksi Bimasakti Terancam Ditabrak Awan Raksasa
Gumpalan awan raksasa yang mengandung gas hidrogen dalam volume sangat besar tengah melesat mendekati piringan Galaksi Bima Sakti, tempat tata surya kita berada. Tabrakan dahsyat yang diperkirakan terjadi antara 20-40 juta tahun lagi akan menghasilkan kembang api spektakuler di langit. Objek tersebut diberi nama Awan Smith, diambil dari nama Gail Smith, seorang astronom AS yang mendeteksinya pertama kali pada tahun 1963 saat meneliti di Universitas Leiden, Belanda. Sejak ditemukan, para astronom masih berdebat apakah awan tersebut benar-benar mendekati galaksi Bimasakti atau menjauhinya. Rekaman data yang ada selama ini masih terbatas dan tidak jelas apakah objek tersebut bagian dari kabut Bimasakti atau masih bergerak ke arahnya. Sejauh ini, para peneliti hanya mendeteksi gas dan tidak ada satupun bintang di dalamnya. Satu-satunya cara melihtanya adlah dengan teleskop radio karena gas dingin tidak memancarkan cahaya, tetapi memantulkan gelombang radio. Jika dilihat dari Bumi, lebar gumpalan awan tersebut sebanding dengan 30 kali lebar Bulan. Dari kepala ke ujung ekornya cukup untuk menyelimuti rasi bintang Orion. Hasil pengamatan baru menggunakan teleskop radio terkendali paling besar di dunia, Teleskop Green Bank (GBT) di Virginia Barat, AS, menunjukkan bahwa objek tersebut bergerak ke arah galaksi Bimasakti. Bahkan, seperti dilaporkan gabungan tim astronom dari Observatorium Astronomi Radio Nasional AS (NRAO) dan Universitas Winconsin Whitewater dalam pertemuan Masyarakat Astronomi Amerika ke-211 di Austin, Texas baru-baru ini, gaya dorongnya telah menyentuh kabut Bimasakti. "Jika tabrakan terjadi, hal tersebut akan memicu lahirnya formasi bintang-bintang baru. Akan banyak bintang raksasa yang terbentuk, berumur pendek, dan meledak sebagai supernova yang memancarkan cahaya menyilaukan," ujar Ketua tim peneliti, DR. Felix Lockman, dari NRAO. Sebab, Awan Smith membawa energi sangat besar berupa gas hidrogen yang cukup untuk membentuk jutaan bintang seukuran Matahari. Awan Smith merupakan gumpalan gas yang berukuran panjang mencapai 11.000 tahun cahaya dan lebar 2.500 tahun cahaya. Objek tersebut saat ini berada 40.000 tahun cahaya dari Bumi dan 8.000 tahun cahaya dari piringan Bimasakti. Objek yang pantas disebut kabut monster di ruang kosmos ini bergerak dengan kecepatan 240 kilometer perdetik dan diperkirakan menabrak piringan galaksi Bimasakti dengan kemiringan 45 derajat. Tabrakan akan terjadi di pinggir piringan Bimasakti yang jarak ke pusatnya hampir sama dengan jarak tata surya kita ke pusat galaksi. Namun, posisinya jauh dari tata surya kita, diperkirakan berjarak 90 derajat terhadap pusat piringan. "Kami tidak tahu dari mana asalnya, apalagi orbitnya membingungkan, namun kami katakan bahwa ia mulai berinteraksi dengan bagian terluar Bimasakti," tandas Lockman.
Sumber: http://id.shvoong.com/humanities/1764634-galaksi-bimasakti-terancam-ditabrak-awan/#ixzz1N7WFDHY1
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