Free Astronomy Magazine January-February 2024 ARABIC VERSION

S Changing conditions around the young star SZ Chamaeleontis by NASA/ESA/CSA Leah Ramsay & Christine Pulliam cientists are following neon signs in a search for clues to one planetary system’s future and the past of another – our own solar system. Following up on a peculiar reading by NASA’s previous infrared flagship observatory, the now-re- tired Spitzer Space Telescope, the agency’s James Webb Space Tele- scope detected distinct traces of the element neon in the dusty disk sur- rounding the young Sun-like star SZ Chamaeleontis (SZ Cha). Differences in the neon readings between Spitzer and Webb point to a never- before-observed change in high-en- ergy radiation that reaches the disk, which eventually causes it to evapo- JANUARY-FEBRUARY 2024 ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 16 اﻟﻈــﺮوف اﻟﻤﺘﻐــ ة ﺣـ ـﻮل اﻟــﻨ ﻢ إ) (سزد ﺗﺸﺎﻣ ﻠﻮﻧﺘ ﺲ : ﻘﻠﻢ ﺑﻮﻟ ﺎم ﻟ ﺎ راﻣﺰيوﻛﺮﺴﺘ و ﺎﻻت اﻟﻔﻀﺎء ﻧﺎﺳﺎ إ ﺴﺎ / / اﻟﻜﻨﺪ ﺔ ﺘﺘﺒﻊ اﻟﻌﻠﻤﺎء إﺷﺎرات اﻟﻨﻴﻮن ﺑﺤﺜًﺎ ﻋﻦ أدﻟﺔ ﺣـﻮل ﻣﺴـﺘﻘﺒﻞ أﺣــﺪ اﻷﻧﻈﻤـﺔ اﻟﻜﻮﻛﺒﻴـﺔ وﻣﺎﴈ ﻧﻈﺎم آﺧﺮ - ﻧﻈﺎﻣﻨﺎ اﻟﺸﻤـ . -ﴘـ ﻣﺘﺎﺑﻌـﺔ ﻟﻘـﺮاءة ﻏﺮﻳﺒـﺔ أﺟﺮاﻫــﺎ ا ﺮﺻـﺪ اﻟﺮﺋﻴﴘ اﻟﺴـﺎﺑﻖ ﻟﻸﺷـﻌﺔ ﺗﺤـﺖ اﻟﺤﻤـﺮاء ـــ ــ اﻟﺘﺎﺑﻊ ﻟﻨﺎﺳﺎ ﺗﻠﺴﻜﻮب ﺳـﺒﻴﺘﺰر اﻟﻔﻀـﺎﺋﻲ ا ﺘﻘﺎﻋﺪ اﻵن، اﻛﺘﺸـﻒ ﺗﻠﺴـﻜﻮب ﺟـﻴﻤﺲ وﻳﺐ اﻟﻔﻀﺎﺋﻲ اﻟﺘﺎﺑﻊ ﻟﻠﻮﻛﺎﻟﺔ آﺛـﺎر اً ﻣﻤﻴـﺰة ﻟﻌﻨﴫ اﻟﻨﻴﻮن ﰲ اﻟﻘﺮص اﻟﻐﺒـﺎري ا ﺤـﻴﻂ ﺑﺎﻟﻨﺠﻢ اﻟﺸﺎب اﻟﺸﺒﻴﻪ ﺑﺎﻟﺸـﻤﺲ إس زد ) ( ــ ﺗﺸﺎﻣﻴﻠﻮﻧﺘﻴﺲ . ﺗﺸ اﻻﺧﺘﻼﻓﺎت ﰲ ﻗﺮاءات اﻟﻨﻴﻮن ﺑ ﺳﺒﻴﺘﺰر ووﻳﺐ إﱃ ﺗﻐ ﻟﻢ ﻳﺴﺒﻖ رﺻﺪه ﻣﻦ ﻗﺒﻞ ﰲ اﻹﺷﻌﺎع ﻋﺎﱄ اﻟﻄﺎﻗﺔ اﻟﺬي ﻳﺼﻞ إﱃ اﻟﻘﺮص ﻣﻤﺎ ﻳـﺆدي ﰲ اﻟﻨﻬﺎﻳـﺔ إﱃ ﺗﺒﺨﺮه ﻣﻤﺎ ﻳﺤﺪ ﻣﻦ اﻟﻮﻗﺖ اﻟـﺬي ﻳﺠـﺐ أن ـــ - ﻳﻨﺎﻳﺮ ﻓﺒﺮﺍﻳﺮ 2 0 2 4