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someone

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  1. someone
    Why space-based observatories are needed for astronomy? i have been asked to write about 3000 thousand words about this topic , and i have no idea because this subject is optional in my course... so if anyone can help me on that please ,,, ibrahim
  2. someone
    السلام عليكم ورحمه الله وبركاته ,,,, انا عندي سؤال وياليت القا الاجابه هنا ماهي اهميه space-based observatory واذا احد عنده لنك اقدر اقرا عنه space-based observatory وفوائدها وشكرا
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