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بسم الله الرحمن الرحيم اما بعد كما وعدتكم بأن احضر لكم استيلات واضافات بس صراحه المجله ديه انتم اتفجئتم منها بس احب افهم المبتدئ اقسم بالله المجله ديه بتنباع بفلوس لأن المجله ... قراءة التالي » |
 The discovery in 1998 that the Universe is actually speeding up its expansion was a total shock to astronomers. It just seems so counter-intuitive, so against common sense. But the evidence has become convincing. The evidence came from studying distant Type Ia supernovae. This type of supernova results from having a white dwarf star in a binary system. ... قراءة التالي » |
 Tools for All AstronomersBecause most of the objects that astronomers observe are so far away, we cannot touch them. Observing the light that they emit is often the only means we have of understanding them. Studying the light that comes from a source can tell us a great deal about what kind of object it is -- we can measure the energy of the light coming from the source, we can measure the amount of light coming from the source, and we can make an image of the source. If we graph the amount of light at different energies, we can make a ... قراءة التالي » |
 Long before experiments could detect
gamma-rays
emitted by cosmic sources, scientists had known that the Universe should be
producing such high energy photons. Hard work by several brilliant scientists had shown us
that a number of different processes which were occurring in the Universe
would result in gamma-ray emission. These processes included cosmic ray
interactions with interstellar gas,
supernova
explosions, and interactions of energetic
...
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