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ملف:True shape of the Boomerang.jpg

محتويات الصفحة غير مدعومة بلغات أخرى.
من ويكيبيديا، الموسوعة الحرة

الملف الأصلي (1٬762 × 1٬762 بكسل حجم الملف: 445 كيلوبايت، نوع MIME: image/jpeg)

ملخص

الوصف
English: This Picture of Week shows the Boomerang Nebula, a protoplanetary nebula, as seen by the Atacama Large Millimeter/submillimeter Array (ALMA). The background purple structure, as seen in visible light with the NASA/ESA Hubble Space Telescope, shows a classic double-lobe shape with a very narrow central region. ALMA’s ability to see the cold molecular gas reveals the nebula’s more elongated shape, in orange.

Since 2003 the nebula, located about 5000 light-years from Earth, has held the record for the coldest known object in the Universe. The nebula is thought to have formed from the envelope of a star in its later stages of life which engulfed a smaller, binary companion. It is possible that this is the cause of the ultra-cold outflows, which are illuminated by the light of the central, dying star.

ALMA looked at the nebula’s central dusty disc and the outflows further out, which span a distance of almost four light-years across the sky. These outflows are even colder than the cosmic microwave background, reaching temperatures below –270 °C. The outflows are also expanding at a speed of 590 000 kilometres per hour.
التاريخ
المصدر http://www.eso.org/public/images/potw1724a/
المؤلف ALMA (ESO/NAOJ/NRAO)/R. Sahai

ترخيص

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١٢ يونيو 2017

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حالي14:51، 12 يونيو 2017تصغير للنسخة بتاريخ 14:51، 12 يونيو 20171٬762 × 1٬762 (445 كيلوبايت)JmencisomUser created page with UploadWizard

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