오늘, 내 인생의 가장 젊은 날
Astronomy Picture of the Day 본문
Astronomy Picture of the Day
Image Credit: Alvin Wu
Image Credit & Copyright: Optical (RGB+Ha): Aldo Mottino & Ezequiel Bellocchio (Argentina); Infrared: ESO/J. Emerson/VISTA.
Image Credit: Subaru Telescope (NAOJ), Hubble Space Telescope;
Processing & Copyright: Roberto Colombari & Robert Gendler
Explanation: What do other star systems look like? To help find out, astronomers are carrying out detailed observations of nearby stars in infrared light to see which have dustdisks that might be forming planets. Observations by NASA's Spitzer Space Telescope and ESA's Herschel Space Observatory have found that planetary system HD 95086 has two dust disks: a hot one near the parent star and a cooler one farther out. An artist's illustration of how the system might appear is featured here, including hypothetical planets with large rings that orbit between the disks. The planets may have created the large gap between the disks by absorbing and deflecting dust with their gravity. HD 95086 is a blue star about 60 percent more massive than our Sun that lies about 300 light years from Earth and is visible with binoculars toward the constellation of Carina. Studying the HD 95086 system may help astronomers better understand the formation and evolution of our own Solar System as well as the Earth.
Explanation: Why is there a bright line on the sky? What is pictured above is actually a disk galaxy being seen almost perfectly edge on. The image from the Hubble Space Telescope is a spectacular visual reminder of just how thin disk galaxies can be. NGC 4762, a galaxy in the nearby Virgo Cluster of Galaxies, is so thin that it is actuallydifficult to determine what type of disk galaxy it is. Its lack of a visible dust lane indicates that it is a low-dust lenticular galaxy, although it is still possible that a view from on top would reveal spiral structure. The unusual stellar line spans about 100,000 light years from end to end. Near NGC 4762's center is a slight bulge of stars, while many background galaxies are visible far in the distance. Galaxies that appear this thin are rare mostly because our Earth must reside (nearly) in the extrapolated planes of their thin galactic disks. Galaxies that actually are this thin are relatively common -- for example our own Milky Way Galaxy is thought to be about this thin.
Image Credit & Copyright: Alessandro Benedetti and Daniele Ceniti (AeW Observatory)
Explanation: This Rosetta spacecraft selfie was snapped on October 7th. At the time the spacecraft was about 472 million kilometers from planet Earth, but only 16 kilometersfrom the surface of comet 67P/Churyumov-Gerasimenko. Looming beyond the spacecraft near the top of the frame, dust and gas stream away from the comet's curiousdouble-lobed nucleus and bright sunlight glints off one of Rosetta's 14 meter long solar arrays. In fact, two exposures, one short and one long, were combined to record thedramatic high contrast scene using the CIVA camera system on Rosetta's still-attached Philae lander. Its chosen primary landing site is visible on the smaller lobe of the nucleus. This is the last image anticipated from Philae's cameras before the lander separates from Rosetta on November 12. Shortly after separation Philae will take another image looking back toward the orbiter, and begin its descent to the nucleus of the comet.
Image Credit: C. R. O'Dell, (Vanderbilt) et al. ESA, NOAO, NASA
Image Credit & Copyright: Dave Lane
Image Credit: NASA, ESA, and the Hubble SM4 ERO Team; Reprocessing & Copyright: Francesco Antonucci
Image Credit: Hubble Legacy Archive, ESA, NASA; Processing & Copyright: Joachim Dietrich
Image Credit: Hubble Legacy Archive, NASA, ESA - Processing & Licence: Judy Schmidt
Image Credit & Copyright: Yuri Beletsky (Las Campanas Observatory, Carnegie Institution)
Image Credit: Hubble Legacy Archive, NASA, ESA - Processing & Licence: Judy Schmidt
Image Credit & Copyright: Mike Mackinven
Image Credit & Copyright: Subaru Telescope (NAOJ), Hubble Space Telescope;
Processing: Robert Gendler & Roberto Colombari
Image Credit: Hubble, Subaru; Composition & Copyright: Robert Gendler
Credit & Copyright: T. Rector (U. Alaska Anchorage) & H. Schweiker (WIYN, NOAO, AURA, NSF)
Image Credit & Copyright: David Lane
Image Credit & Copyright: Matipon Tangmatitham
Image Credit: Subaru Telescope (NAOJ), Hubble Space Telescope; Image Assembly, Processing, & Copyright: Robert Gendler
Image Credit: Debra Meloy Elmegreen (Vassar College) et al.,
& the Hubble Heritage Team (AURA/STScI/NASA)
Image Credit & Copyright: P.-A. Duc (CEA, CFHT), Atlas 3D Collaboration
Image Credit & Copyright: Jeff Husted
Image Credit: Data - Hubble Legacy Archive, ESA, NASA; Processing - Roberto Colombari
Image Credit: NASA, ESA, Hubble Heritage (STScI/AURA); Acknowledgement: A. Reiss et al. (JHU)
Image Credit: Subaru Telescope (NAOJ) & DSS;
Assembly and Processing: Robert Gendler
Image Credit & Copyright: John H. Moore; Annotation: Judy Schmidt
Video Credit & Copyright: Mike Oblinski; Music: Impact Lento (Kevin MacLeod, Incompetech)
Image Credit & Copyright: Yuri Beletsky (Las Campanas Observatory, Carnegie Institution)
Image Credit & Copyright: Desert Hollow Observatory
Image Credit & Copyright: César Blanco González
Image Credit & Copyright: Sean R. Heavey
Composition and Processing: Robert Gendler
Image Data: ESO, VISTA, HLA, Hubble Heritage Team (STScI/AURA)
Image Credit: NASA, ESA, and The Hubble Heritage Team (STSci/AURA)
Image Credit: Subaru Telescope (NAOJ), Hubble Space Telescope,
Color data: Wolfgang Promper, Processing: Robert Gendler
Image Credit & Copyright: Bernard Miller
Video Credit: Gateway to Astronaut Photography, NASA ; Compilation: David Peterson (YouTube);
Music: Freedom Fighters (Two Steps from Hell)
Image Credit & Copyright: Reinhold Wittich
Illustration Credit: Harvard-Smithsonian Center for Astrophysics
Credit: Image Data - Hubble Legacy Archive, Robert Gendler, Jay GaBany, Processing - Robert Gendler
Image Credit: Subaru Telescope (NAOJ), Hubble Space Telescope, Martin Pugh; Processing: Robert Gendler
Credit & Copyright: Nick Pavelchak
Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA) - ESA/Hubble Collaboration
Image Credit: NASA, ESA, Hubble Heritage Team (STScI/AURA)
2012.12.12
Milky Way Over Quiver Tree Forest
Image Credit & Copyright: Florian Breuer
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