Free Astronomy Magazine November-December 2026 ARABIC VERSION

GW Orionis lies about 1,300 light- years away in the Orion constella- tion. Its three young stars are encircled by a massive disk whose threedustringsaretiltedatdiffer-ent angles instead of sharing a sin-gle plane. This unusual geometry has made the system an important laboratory for studying how com- plexstellarenvironmentsinfluence the disks where planets form. The research was led by Maria Gal- loway-Sprietsma, a PhD candidateat the University of Florida. The team fitted the streamer’s shapeandvelocitytoreconstructitstraj ec-tory. Their best-fit model places the streamer’sangular- momentumvec- tor within about 3 degrees of the outer ring, compared with a mis- alignment of about 32 degrees rel- ative to the inner ring. This close correspondence suggests that the infallingmaterialisthelikelydriver oftheouterdisk’stiltedstructure. Theresultsupportsamoredynamic picture of planet formation than the familiar model of an isolated, orderly disk. Material from a sur- rounding molecular cloud can con- tinue to fall onto an evolved young systeminclumpystreams,changing a disk’s mass and angular momen- tumandpotentiallyinfluencingthe orbitalarchitectureofplanetsthat formthere.     NOVEMBER-DECEMBER2026 ﻗﺮﺻﻴﺔ ﺿﺨﻤﺔ ﺗﻀﻢ ﺛﻼث ﺣ ﻠﻘـﺎت ﻏﺒﺎرﻳـﺔ ﻣﺎﺋﻠـﺔ ﺑﺰواﻳـﺎ ﻣﺨﺘﻠﻔـﺔ ﺑـﺪﻻً ﻣـﻦ أن ﺗﻘـﻊ ﺟﻤﻴﻌﻬﺎ ﰲ ﻣﺴﺘﻮى واﺣـﺪ وﻗـﺪ ﺟﻌـﻞ ﻫـﺬا ا ﻟﺘﻜﻮﻳﻦ ﻏ ا ﻌﺘﺎد اﻟﻨﻈـﺎم ﻣﺨﺘـﱪ اً ﺎً ﻣﻬﻤـ ﻟﺪراﺳﺔ ﻛﻴﻔﻴﺔ ﺗﺄﺛ اﻟﺒﻴﺌﺎت اﻟﻨﺠﻤﻴﺔ ا ﻌﻘﺪة ﰲ اﻷﻗــﺮاص اﻟﺘـﻲ ﺗﺘﺸـﻜﻞ ﻓﻴﻬـﺎ اﻟﻜﻮاﻛـﺐ وﻗ ﺎدت اﻟﺒﺤﺚ ﻣﺎرﻳﺎ ﻏﺎﻟﻮاي ﺳﱪﻳﺘﺴﻤﺎ وﻫﻲ ﻃﺎﻟﺒﺔ دﻛﺘﻮراه ﰲ ﺟﺎﻣﻌﺔ ﻓﻠﻮرﻳﺪا . وﻗﺎم اﻟﻔﺮﻳﻖ ﺑﻤﻼءﻣﺔ ﺷـﻜﻞ اﻟﺘﻴـﺎر ا ﻟﻐـﺎزي وﴎﻋﺘﻪ ﻹﻋﺎدة ﺑﻨﺎء ﻣﺴﺎر ه وأﻇﻬـﺮ أﻓﻀـﻞ ﻧﻤﻮذج أن اﺗﺠﺎه ﻣﺘﺠﻪ اﻟﺰﺧﻢ اﻟـﺰاوي ﻟﻠﺘﻴـﺎر ﻳﺨﺘﻠﻒ ﺑﻨﺤﻮ 3 درﺟـﺎت ﻓﻘـﻂ ﻋـﻦ اﺗﺠـﺎه اﻟﺤﻠﻘﺔ اﻟﺨﺎرﺟﻴﺔ، ﻣﻘﺎرﻧﺔً ﺑﻨﺤـﻮ 32 رﺟـﺔ د ﺑﺎﻟﻨﺴﺒﺔ إﱃ اﻟﺤﻠﻘـﺔ اﻟﺪاﺧﻠﻴـﺔ وﻳﺸـ ﻫـﺬا اﻟﺘﻮاﻓﻖ اﻟﻮﺛﻴـﻖ إﱃ أن ا ـﺎدة ا ﺘﺪﻓﻘـﺔ ﻧﺤـﻮ ـــــــــــــــــــــــــــــــــــــ اﻟﻨﻈﺎم ﻗﺪ ﺗﻜﻮن اﻟﻌﺎﻣﻞ ا ﺴﺆول ﻋـﻦ إﻣﺎﻟـﺔ اﻟﺒﻨﻴـﺔ اﻟﺨﺎرﺟﻴـﺔ ﻟﻠﻘـﺮص وﻫـﺬا ﻳﻌﻨـﻲ أن اﻟﻘﺮص اﻟﻜﻮﻛﺒﻲ اﻷوﱄ ﻻ ﻳﺘﻄﻮر ﺑﺎﻟ رة ﴬو ـ ﰲ ﻋﺰﻟﺔ ﻋﻦ اﻟﺒﻴﺌﺔ ا ﺤﻴﻄﺔ ﺑﻪ ﺑﻞ ﻗﺪ ﻳﺴـﺘﻤﺮ ﰲ اﺳﺘﻘﺒﺎل ا ﺎدة ﻣﻦ اﻟﺴﺤﺎ ﺑﺔ اﻟﺘﻲ وﻟﺪ ﻣﻨﻬﺎ اﻟﻨﻈﺎم وﻗﺪ ﻳﺆدي ﻫﺬا اﻟﺘـﺪﻓﻖ اﻟﺨـ ﺎرﺟﻲ إﱃ ﺗﻐﻴ اﺗﺠﺎه دوران اﻟﻘﺮص وﺗﻮزﻳـﻊ ﻣﺎدﺗـﻪ ﺗﺪﻋﻢ ﻫﺬه اﻟﻨﺘﻴﺠﺔ ﺗﺼﻮر اً أﻛﺜـﺮ دﻳﻨﺎﻣﻴﻜﻴـﺔ ﻟﺘﺸﻜﻞ اﻟﻜﻮاﻛﺐ ﻣﻘﺎرﻧﺔ ﺑﺎﻟﻨﻤ ﻮذج اﻟﺘﻘﻠﻴـﺪي ﻟﻘﺮص ﻣﻌـﺰول وﻣﻨـﺘﻈﻢ إذ ﻳﻤﻜـﻦ ﻟﻠﻤـﺎدة اﻟﻘﺎدﻣﺔ ﻣـﻦ ﺳـﺤﺎﺑﺔ ﺟﺰﻳﺌﻴـﺔ ﻣﺤﻴﻄـﺔ أن ﺗﺴﺘﻤﺮ ﰲ اﻟﺘﺪﻓﻖ ﻧﺤـﻮ ﻧﻈـﺎم ﻧﺠﻤـﻲ ﻓﺘـ ﻲ وﻣﺘﻄﻮر ﻋﲆ ﻫﻴﺌﺔ ﺗﻴﺎرات ﻣﺘﻜﺘﻠﺔ ﻓﺘ ﻐ ﻛﺘﻠﺔ اﻟﻘﺮص وزﺧﻤﻪ اﻟﺰاوي ورﺑﻤﺎ ﺗﺆﺛﺮ ﰲ اﻟﺒﻨﻴـﺔ ا ﺪارﻳﺔ ﻟﻠﻜﻮاﻛﺐ اﻟﺘﻲ ﺗﺘﺸﻜﻞ داﺧﻠﻪ . ﻧﻮﻓﻤﺒﺮ - ﺩﻳﺴﻤﺒﺮ 2 0 2 6