الفضاء

اكتشاف كوكبٍ "مارقٍ" جديدٍ خارج نظامنا الشّمسيّ، على بعد 20 سنةٍ ضوئيّة من الأرض

اكتشاف كوكبٍ “مارقٍ” جديدٍ خارج نظامنا الشّمسيّ، على بعد 20 سنةٍ ضوئيّة من الأرض، وهو أكبرُ من المشتري قرابةَ 12 مرّة؛ وبذلك فهو أصغرُ من قزمٍ بنيّ وأكبرُ من الكواكبِ المعروفة.
تصل درجةُ حرارةِ سطحه إلى 825 درجةٍ مئويّة، ومجالُه المغناطيسيُّ أشدُّ من مجالِ المشتري المغناطيسيِّ بمئتي مرّة!

تكمن أهميّة دراسته في أنّها تُتيح معرفةَ آليّة تشكّل الحقول المغناطيسيِّة في الكواكب خارج مجموعتنا الشّمسيّة.


الحاشية:

1- “المارق”: اسمٌ يُطلق على الكواكبِ الّتي لاتتبع لأيِّ مدار، ولا تدور حول أيِّ نجم، وإنّما تتحرّك في الفضاء بمفردها.
2- الأقزام البنيِّة: هي أجرامٌ دون نجميّة، تمتلك كتلةً بين كتلتيّ أثقل الكواكب من فئة العملاق الغازيِّ وأخفّ النّجوم؛ أو تبلغ 13 إلى 75-80 ضعف كتلة المشتري تقريبًا.


 

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