وجعلناها رجوما للشياطين أي جعلنا شهبها ; فحذف المضاف . دليله : إلا من خطف الخطفة فأتبعه شهاب ثاقب . وعلى هذا فالمصابيح لا تزول ولا يرجم بها .)
وجعلناها رجوما للشياطين أي جعلنا شهبها ; فحذف المضاف . دليله : إلا من خطف الخطفة فأتبعه شهاب ثاقب . وعلى هذا فالمصابيح لا تزول ولا يرجم بها .)
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| A computer animation of a gamma-ray burst. (10 MB QT) (Description) (Credit: NASA / SkyWorks Digital) |
are sudden, intense flashes of gamma-rays which, for a few blinding seconds, light up in an otherwise fairly dark gamma-ray sky. They are detected at the rate of about once a day, and while they are on, they outshine every other gamma-ray source in the sky, including the sun. Major advances have been made in the last three or four years, including the discovery of slowly fading x-ray, optical and radio afterglows of GRBs, the identification of host galaxies at cosmological distances, and finding evidence for many of them being associated with star forming regions and possibly supernovae. Progress has been made in understanding how the GRB and afterglow radiation arises in terms of a relativistic fireball shock model. This is described in a recent non-specialist GRB review or a more detailed review on GRB and afterglows. A summary of some of the specific research activities on GRB at Penn State is given in the previous link. The rest of this page gives a general overview of GRB." (Source)
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