وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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عبارة عن أشعة كهرومغناطيسية لا ترى بالعين المجردة ذات طول موجة قصير للغاية وتردد عالي جداً يسمح لها باختراق بعض الأشياء والرؤية من خلالها مثل جلد الإنسان. اكتشف العالم فيلهلم رونتجن الأشعة السينية عام 1985 وأطلق عليها هذا الاسم للإشارة إلى كونها نوع مجهول من الأشعة. وتستخدم اليوم في مجال واسع من التطبيقات مثل التصوير الطبي وعلاج الأمراض والتفتيش في قطاع النقل وعلوم الفضاء وغيرها.
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