Free Astronomy Magazine July-August 2025 ARABIC VERSION

Strong magnetic fields in the star-forming region Sagittarius C byNASA/ESA/CSA LeahRamsay5ChristinePulliam ollow-up research on a 2023 imageoftheSagittariusCstel- larnurseryintheheartofour Milky Way galaxy, captured by NASA’s James Webb Space Tele- scope, has revealed ejections from still-forming protostars and insights into the impact of strong magnetic fields on interstellar gas and the life cycle of stars. “A big question in the Central Mo- lecular Zone of our galaxy has been, if there is so much dense gas and cosmic dust here, and we know that starsforminsuchclouds,whyareso few stars born here?” said astro- physicistJohnBallyoftheUniversity of Colorado Boulder, one of the principal investigators. “Now, forthefirsttime,weareseeingdirectly that strong magnetic fields mayplay an important role in suppress- ing star formation, even at small scales.” Detailedstudyofstarsinthis crowded, dusty region has been limited, but Webb’s advanced near- infrared instruments have allowed astronomers to see through the clouds to study young stars likenever before. JULY-AUGUST2025 ﻣﺠﺎﻻتﻣﻐﻨﺎﻃ ﺴ ﺔ ﺗﻨﻈﻢوﻻدة اﻟﻨﺠﻮمﻓﻲ ﺳﺎﺟ ﺘﺎر ﻮس C : ﻘﻠﻢ ﻟ ﺎ راﻣﺰي و ﺑﻮﻟ ﺎم ﻛﺮﺴﺘ و ﺎﻟﺔ ﻧﺎﺳﺎ / و ﺎﻟﺔ اﻟﻔﻀﺎء اﻷوروﺑ ﺔ / و ﺎﻟﺔ اﻟﻔﻀﺎء اﻟﻜﻨﺪ ﺔ ﻛﺸـﻔﺖ دراﺳﺔ ﻣﺘﺎﺑﻌﺔ ﻟﺼﻮرةٍ ﻓﻠﻜﻴﺔ ﺗﻌﻮد ﻟﻌﺎم 2023 ﺿﺎ ﻟﺤ ﻨﺔ ﻧﺠﻤﻴﺔ ﰲ ﻗﻠـﺐ ﻣﺠـﺮة درب اﻟﺘﺒﺎﻧﺔ اﻟﺘﻘﻄﻬﺎ ﺗﻠﺴﻜﻮ ب ﺟﻴﻤﺲ وﻳـﺐ اﻟﻔﻀﺎﺋﻲ اﻟﺘﺎﺑ ﻊ ﻟﻮﻛﺎﻟﺔ ﻧﺎﺳﺎ ﻋـﻦ اﻧﺒﻌﺎﺛـ ﺎتٍ ﻣﻦ ﻧﺠﻮمٍ أوﻟﻴـﺔٍ ﻻ ﺗـﺰال ﰲ ﻃـﻮر اﻟﺘﻜـﻮﻳﻦ ورؤى ﺛﺎﻗﺒﺔ ﺣﻮل ﺗﺄﺛ ا ﺠﺎﻻت ا ﻐﻨﺎﻃﻴﺴﻴﺔ اﻟﻘﻮﻳﺔ ﻋﲆ اﻟﻐﺎز ﺑـ اﻟﻨﺠـﻮم ودورة ﺣﻴـﺎة اﻟﻨﺠﻮم . ﻗﺎل ﻋﺎﻟﻢ اﻟﻔﻴﺰﻳﺎء اﻟﻔﻠﻜﻴﺔ ﺟ ﻮن ﺑﺎﱄ ﻣﻦ ﺟﺎﻣﻌﺔ ﻛﻮﻟﻮرادو ﺑﻮﻟﺪر ﻣﻦ ﺟﺎﻣﻌﺔ ﻛﻮﻟﻮرادو ﺑﻮﻟﺪر وأﺣـﺪ اﻟﺒـﺎﺣﺜ اﻟﺮﺋﻴﺴﻴ " : ﻛﺎن اﻟﺴـﺆال ا ﻬـﻢ ﰲ ا ﻨﻄﻘـﺔ اﻟﺠﺰﻳﺌﻴ ﺔ ا ﺮﻛﺰﻳﺔ ﺠﺮﺗﻨﺎ ﻫﻮ : إذا ﻛﺎن ﻳﻮﺟـﺪ ﻫﺬا اﻟﻜﻢ اﻟﻬﺎﺋﻞ ﻣﻦ اﻟﻐـﺎز اﻟﻜﺜﻴـﻒ واﻟﻐﺒـﺎر اﻟﻜﻮﻧﻲ ﻫﻨﺎ وﻧﺤﻦ ﻧﻌﻠﻢ أ ن اﻟﻨﺠﻮم ﺗﺘﺸﻜﻞ ﰲ ﻣﺜﻞ ﻫﺬه اﻟﺴﺤﺐ ﻓﻠﻤﺎذا ﻻ ﻳﻮﻟﺪ ﺳـﻮى ﻋـﺪد ﻗﻠﻴﻞ ﺟﺪ اً ﻣﻦ اﻟﻨﺠـﻮم ﻫﻨـﺎ؟ " واﻵن وﻟﻠﻤـﺮة اﻷوﱃ ﻧــﺮى ﺑﺸــﻜﻞ ﻣﺒــﺎﴍ أن ا ﺠــﺎﻻت ا ﻐﻨﺎﻃﻴﺴﻴﺔ اﻟﻘﻮﻳﺔ ا ﻐﻨﺎﻃﻴﺴﻴﺔ اﻟﻘﻮﻳﺔ ﻗﺪ ﺗﻠﻌـﺐ دوراً ﻫﺎﻣـﺎً ﰲ ﻗﻤﻊ ﺗﺸـﻜ ﻞ اﻟﻨﺠـﻮم، ﺣﺘـﻰ ﻋـﲆ ﻧﻄﺎﻗـﺎت " ﺻﻐ ة وﻛﺎﻧﺖ اﻟﺪراﺳﺔ اﻟﺘﻔﺼﻴﻠﻴﺔ ﻟﻠﻨﺠـﻮم ﰲ ﻫﺬه ا ﻨﻄﻘﺔ ا ﻠﻴﺌﺔ ﺑﺎﻟﻐﺒﺎر ﻣﺤﺪودة وﻟﻜﻦ أدوات اﻷﺷﻌﺔ ﺗﺤﺖ اﻟﺤﻤﺮاء اﻟﻘﺮﻳﺒﺔ ا ﺘﻘﺪﻣﺔ ﻋﲆ ﺗﻠﺴﻜﻮب وﻳﺐ ﺳـﻤﺤﺖ ﻟﻌﻠﻤـﺎء اﻟﻔﻠـﻚ ﺑﺮؤﻳـﺔ ﻣـﺎ وراء اﻟﺴـ ﺤﺐ ﻟﺪراﺳـﺔ اﻟﻨﺠـﻮم اﻟﺼﻐ ة ﺑﺸﻜﻞ ﻟﻢ ﻳﺴﺒﻖ ﻟﻪ ﻣﺜﻴﻞ ﻣﻦ ﻗﺒﻞ . ﻳﻮﻟﻴﻮ - ﺃﻏﺴﻄﺲ 2 0 2 5