File:HST betaPictoris comb.jpg
HST_betaPictoris_comb.jpg (800 × 467 像素,檔案大小:446 KB,MIME 類型:image/jpeg)
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[編輯]描述HST betaPictoris comb.jpg |
Hubble Sees Two Dust Disks Around Beta Pictoris This Hubble Space Telescope view of Beta Pictoris clearly shows a primary dust disk and a much fainter secondary dust disk. The secondary disk extends at least 24 billion miles from the star and is tilted roughly 4 to 5 degrees from the primary disk. The secondary disk is circumstantial evidence for the existence of a planet in a similarly inclined orbit. The planet may have indirectly formed the secondary disk by sweeping up smaller planetesimals – chunks of rock and/or ice – from the main disk. The planetesimals then collide, producing the dust seen in the disk. The image, taken with the Advanced Camera for Surveys (ACS), is the sharpest visible-light view of the disks around Beta Pictoris. Astronomers used the Advanced Camera's coronagraph to block out the light from the bright star. The black circle in the center of the image marks the coronagraphic mask. The colorful spike-like features and the speckled background are artifacts of the image processing which removed the residual starlight. The color image reveals that the disk is slightly red. The disk appeared gray in previous images taken by ground-based telescopes. Though astronomers are not sure why the disk is red, they think it is due to compact or fluffy grains of graphite and silicates, which may be as small as smoke particles. The image was taken Oct. 1, 2003. |
日期 | |
來源 | Hubble News Release, Number: STScI-2006-25: "Hubble Reveals Two Dust Disks Around Nearby Star Beta Pictoris". June 27, 2006 |
作者 | David Golimowski (Johns Hopkins University), NASA, ESA |
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NASA PD |
其他版本 | Derivative works of this file: HST betaPictoris comb cs.jpg |
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[編輯]Public domainPublic domainfalsefalse |
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This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org. For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag. |
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目前 | 2006年7月1日 (六) 01:11 | ![]() | 800 × 467(446 KB) | Awolf002(對話 | 貢獻) | {{Information |Description=Hubble Space Telescope image of Beta Pictoris' dusk disk. |Source=[http://hubblesite.org/newscenter/newsdesk/archive/releases/2006/25/image/a] |Date=October 1, 2003 |Author=Holland Ford (Johns Hopkins University) and Garth Illin |
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