Free Astronomy Magazine July-August 2025 ARABIC VERSION

Life unlikely onK2-18 b byMicheleFerrara revisedbyDamianG.Allis NASASolarSystemAmbassador nApril16,ateamofas- tronomersfromtheUni- versityofCambridge(UK) announcedthediscoveryofdi- methyl sulfide in the atmosphereoftheexoplanetK2- 18b.That announcementquicklywentviral through the media, as dimethyl sul- fide is a gas also present on Earth, where it is synthesized almost ex- clusively by microorganisms. That was enough to make people shout about the discovery of life on an- other planet. But what is the current state of things? Now a few months past the imprudententhusiasmthathasper- vaded the generalist information (or disinformation) media, and after supporters and skeptics alike havehadtimetoexpresstheiropin- ions on the subject, we will try to putsomeorderontheissuesothat each reader can have their own in- formed opinion on what the Cam- bridgeastronomersclaimedtohave discovered. JULY-AUGUST2025 O : ﻘﻠﻢ ﻣ ﺸﻴ ﻞ ﻓ ﺮا ﺗﻤﺖ ﻣﺮاﺟﻌﺘﮫ ﺑﻮاﺳﻄﺔ داﻣ ﺎن ﺟﻲ أﻟ ﺲ ﺑﺮ ﺎﻣﺞ ﺳﻔ اﻟﻨﻈﺎم اﻟﺸﻤﺴﻲ ﺑﻮ ﺎﻟﺔ ﻧﺎﺳﺎ اﺳﺘ ﻌﺎد اﻣ ﺎﻧ ﺔ وﺟﻮد ﺣ ﺎة ﻋﻠﻰاﻟ ﻮﻛﺐ K2-18b ﺗﻈﻬـﺮ اﻟﺼــﻮرة ــﺪة ﻣــﻦ اﻟ ﻮا ﻓــﻲ اﻟـــﺨﻠﻔ ﺔ ﻋــﺎﻟﻢ ﻣﺤ ﻄــﺎت ﻣﺤﺘﻤـﻞ وﻫــﻮ ﻓﺌــﺔ ﺟﺪ ﻛــﺐ ﺗﺸــ ﮫ اﻟ ﻮاﻛــﺐ ـﺪروﺟ ﺎﻟﻬ ـﻒ ﻏـ اﻟﻨ ﺘﻮﻧ ﺔ اﻟﻔﺮﻋ ﺔ وﻟﻜﻦ ﺴﻄﺢ ﻣﻐﻄﻰ ﺎﻟ ﺎﻣﻞ ﻤﺤـ ﻂ ﻌﻠـﻮﻩ ﻏـﻼفﺟـﻮيﻛﺜ . ﻳﻮﺟﺪ ﺣﻮاﻟﻲ 15 ﻣﺮﺷﺤﺎً ﻓﻘﻂ ﻤﺎ ﻓﻲ ذﻟﻚ K2-18 b [Amanda Smith, University of Cambridge] أﻋﻠـﻦ ﻓﺮﻳﻖ ﻣﻦ ﻋﻠﻤﺎء اﻟﻔﻠـﻚ ﻣـﻦ ﺟﺎﻣﻌـﺔ ﻛﺎﻣﱪﻳـﺪج ) ا ﻤﻠﻜــﺔ ا ﺘﺤـﺪة ﰲ ( 16 أﺑﺮﻳـﻞ 2025 ﰲ ﻋﻦ اﻛﺘﺸﺎف ﺛﻨﺎﺋﻲ ﻣﻴﺜﻴﻞ اﻟﻜﱪﻳﺘﻴﺪ ﰲ اﻟﻐﻼف اﻟﺠﻮي ﻟﻠﻜﻮﻛﺐ K2-18b وﴎﻋﺎن ﻣﺎ اﻧﺘ ﴩ ﻫﺬا اﻹﻋﻼن ﰲ وﺳﺎﺋﻞ اﻹﻋﻼم ﺣﻴـﺚ أن ﺛﻨﺎﺋﻲ ﻣﻴﺜﻴﻞ اﻟﻜﱪﻳﺘﻴﺪ ﻫـﻮ ﻏـﺎز ﻣﻮﺟـﻮد ـــــ أﻳﻀﺎً ﱃ اﻷرضﺣﻴﺚ ﻳﺘﻢ ﺗﺼﻨﻴﻌﻪ ﺑﺸﻜﻞ ﺷﺒﻪ ﻛﺎﻣﻞ ﺑﻮاﺳﻄﺔ اﻟﻜﺎﺋﻨﺎت اﻟﺤﻴﺔ اﻟﺪﻗﻴﻘﺔ ﻛـﺎن ذﻟﻚ ﻛﺎﻓﻴـﺎً ﻟﺠﻌـﻞ اﻟﻨـﺎس ﻳﺘﻔـﺎﺋﻠﻮن ﺣـﻮل اﻛﺘﺸﺎف اﻟﺤﻴﺎة ﻋﲆ ﻛﻮﻛﺐ آﺧﺮ . وﻟﻜﻦ ﻣﺎ ﻫﻮ اﻟﻮﺿﻊ اﻟﺤﺎﱄ ﻟﻠﻘﺼﺔ ؟ اﻵن وﺑﻌﺪ ﻣﺮور ﺑﻀﻌﺔ أﺷﻬﺮ ﻋﲆ اﻟﺤﻤﺎس ﻏ اﻟﺤﻜﻴﻢ اﻟﺬي ﺳﺎد وﺳﺎﺋﻞ اﻹﻋﻼم اﻟﻌﺎﻣﺔ ﻣـﻊ ﺿـﺠﺔ ﻛﺒ ة وﺗﻔﺴ ات رﺑﻤـﺎ ﺟﺎﻧﺒﻬـﺎ اﻟﺼـﻮ اب أو ا ﺒﺎﻟﻐﺔ اﻹﻋﻼﻣﻴﺔ أﺣﻴﺎﻧ . ﺎً وﺑﻌﺪ أن اﺳﺘﻐﺮق ا ﺆﻳﺪون وا ﺸﻜﻜﻮن ﻋـﲆ ﺣﺪ ﺳﻮاء وﻗﺘًﺎ ﻃـﻮﻳﻼً ﰲ ﻋـﺮض ا ﻌﻠﻮﻣـﺎت ا ﺘﺎﺣﺔ ووﺟﻬﺎت اﻟﻨﻈﺮ ا ﺨﺘﻠﻔﺔ ﺣـﻮل ﻫـﺬا ا ﻮﺿﻮع ﺳﻨﺤﺎول أن ﻧﻀﻊ ﺑﻌﺾ اﻟﱰﺗﻴﺐ ﰲ ﻫﺬه ا ﺴﺄﻟﺔ ﻣـﻊ ﺗﻘـﺪﻳﻢ ﺗﺤﻠﻴـﻞ ﻣﻮﺿـﻮﻋﻲ ﻟﻠﺒﻴﺎﻧﺎت ا ﺘﺎﺣﺔ وﻣﺮاﻋﺎة اﻟﺘﻔﺴ ات ا ﺨﺘﻠﻔﺔ ﺣﺘﻰ ﻳﻜﻮن ﻟﻜﻞ ﻗـﺎرئ رأﻳـﻪ اﻟﺨـﺎص ﻓﻴﻤـﺎ ادﻋﻰ ﻋﻠﻤﺎء اﻟﻔﻠﻚ ﰲ ﻛﺎﻣﱪ ﻳﺪج اﻛﺘﺸﺎﻓﻪ . ﻳﻮﻟﻴﻮ - ﺃﻏﺴﻄﺲ 2 0 2 5 ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 4