پرونده:Stars with Planets and Dusty Disks.jpg
پروندهٔ اصلی (۱٬۵۰۰ × ۱٬۲۰۰ پیکسل، اندازهٔ پرونده: ۷۰۰ کیلوبایت، نوع MIME پرونده: image/jpeg)
این پرونده در ویکیانبار موجود است. محتویات صفحهٔ توصیف آن در زیر نمایش داده میشود. |
خلاصه
توضیحStars with Planets and Dusty Disks.jpg |
English: NASA's Spitzer Space Telescope recently captured these infrared images of six older stars with known planets. The yellow, fuzzy blobs are stars circled by disks of dust, or "debris disks," like the one that surrounds our own Sun. Though astronomers had predicted that stars with planets would harbor debris disks, they could not detect such disks until now.
Spitzer was able to sense these dusty disks via their warm infrared glows. Specifically, the presence of the disks was inferred from an excess amount of infrared emission relative to what is emitted from the parent star alone. The stars themselves are similar in age and temperature to our Sun. In astronomical terms, they are stellar main sequence stars, with spectral types of F, G, or K. These planet-bearing stars have a median age of four billion years. For reference, our Sun is classified as a G star, with an age of approximately five billion years. The disks surrounding these planetary systems are comprised of cool material, with temperatures less than 100 Kelvin (-173 degrees Celsius). They are10 times farther away from their parent stars than Earth is from the Sun, and are thought to be analogues of the comet-filled Kuiper Belt in our solar system. The contrast scale is the same for each image. The images are approximately 2 arcminutes on each side. North is oriented upward and east is to the left. The pictures were taken with the 70-micron filter of Spitzer's multiband imaging photometer. The telescope resolution at 70 microns is 17 arcseconds and there is no evidence for any emission extended beyond the telescope resolution. |
تاریخ | |
منبع | http://www.spitzer.caltech.edu/images/1352-ssc2004-22c-Is-There-Anybody-Home- |
پدیدآور | NASA/JPL-Caltech/C. Beichman (Caltech) |
Image use policy: http://www.spitzer.caltech.edu/info/18-Image-Use-Policy
اجازهنامه
Public domainPublic domainfalsefalse |
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هشدارها:
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آیتمهایی که در این پرونده نمایش داده شدهاند
توصیفها
۹ دسامبر 2004
تاریخچهٔ پرونده
روی تاریخ/زمانها کلیک کنید تا نسخهٔ مربوط به آن هنگام را ببینید.
تاریخ/زمان | بندانگشتی | ابعاد | کاربر | توضیح | |
---|---|---|---|---|---|
کنونی | ۲۱ ژوئن ۲۰۱۱، ساعت ۱۸:۰۳ | ۱٬۵۰۰ در ۱٬۲۰۰ (۷۰۰ کیلوبایت) | Spitzersteph |
کاربرد پرونده
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فراداده
این پرونده حاوی اطلاعات اضافهایست که احتمالاً دوربین دیجیتال یا پویشگری که در ایجاد یا دیجیتالی کردن آن به کار رفته آن را افزوده است. اگر پرونده از وضعیت ابتداییاش تغییر داده شده باشد آنگاه ممکن است شرح و تفصیلات موجود اطلاعات تصویر را تماماً بازتاب ندهد.
عنوان تصویر | NASA's Spitzer Space Telescope recently captured these infrared images of six older stars with known planets. The yellow, fuzzy blobs are stars circled by disks of dust, or "debris disks," like the one that surrounds our own Sun. Though astronomers had predicted that stars with planets would harbor debris disks, they could not detect such disks until now.
Spitzer was able to sense these dusty disks via their warm infrared glows. Specifically, the presence of the disks was inferred from an excess amount of infrared emission relative to what is emitted from the parent star alone. The stars themselves are similar in age and temperature to our Sun. In astronomical terms, they are stellar main sequence stars, with spectral types of F, G, or K. These planet-bearing stars have a median age of four billion years. For reference, our Sun is classified as a G star, with an age of approximately five billion years. The disks surrounding these planetary systems are comprised of cool material, with temperatures less than 100 Kelvin (-173 degrees Celsius). They are10 times farther away from their parent stars than Earth is from the Sun, and are thought to be analogues of the comet-filled Kuiper Belt in our solar system. The contrast scale is the same for each image. The images are approximately 2 arcminutes on each side. North is oriented upward and east is to the left. The pictures were taken with the 70-micron filter of Spitzer's multiband imaging photometer. The telescope resolution at 70 microns is 17 arcseconds and there is no evidence for any emission extended beyond the telescope resolution. |
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تصویربردار/هنرمند | Spitzer Space Telescope |
دارندهٔ حق تکثیر | http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
عرض | ۱٬۵۰۰ px |
طول | ۱٬۲۰۰ px |
شِمای فشردهسازی | LZW |
ترکیب نقاط | RGB |
جهت | عادی |
تعداد اجزا | ۳ |
تفکیکپذیری افقی | ۳۰۰ نقطه در اینچ |
تفکیکپذیری عمودی | ۳۰۰ نقطه در اینچ |
آرایش دادهها | قالب فربه |
نرمافزار استفادهشده | Adobe Photoshop CS3 Macintosh |
تاریخ و زمان تغییر پرونده | ۵ ژوئن ۲۰۰۹، ساعت ۱۴:۴۲ |
فضای رنگی | sRGB |