Free Astronomy Magazine January-February 2024 ARABIC VERSION

O Is the universe really 26.7 billion years old? by Michele Ferrara revised by Damian G. Allis NASA Solar System Ambassador bservations of the early uni- verse with the James Webb Space Telescope have found astronomers faced with a rather dis- concerting reality, confirming and reinforcing what, a few years ear- lier, had been called the “impossible early galaxy problem.” It’s about the fact that a now non-negligible num- ber of galaxies, existing be- tween 500 and 800 million years after the Big Bang, show disks and ha- los similar to t hos e ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 4 ﻫﻞ أن ﺻﺤﻴﺢ ﻋﻤﺮاﻟ ﻮن 26.7 ﻣﻠ ﺎرﺳﻨﺔ ؟! ﻣ: ﻘﻠﻢ ﺸﻴﻞ ﻓ ارا ﻧﻘﺤﮫ داﻣ ﺎن ج . أﻟ ﺲ - ﺳﻔ ﻧﺎﺳﺎ ﻟﻠﻨﻈﺎم اﻟﺸﻤﺴﻲ وﺟــﺪت ﻋﻤﻠﻴــﺎت رﺻــﺪ اﻟﻜــﻮن ا ﺒﻜــﺮ ﺑﺎﺳﺘﺨﺪام ﺗﻠﺴﻜﻮب ﺟﻴﻤﺲ وﻳﺐ اﻟﻔﻀ ﺎﺋﻲ أن ﻋﻠﻤﺎء اﻟﻔﻠﻚ ﻳﻮاﺟﻬﻮن وا ﺎً ﻗﻌـ إﱃ ﺎً ﻣﺮﺑﻜـ ﺣﺪ ﻣﺎ، ﻣﻤﺎ ﻳﺆﻛﺪ وﻳﻌﺰز ﻣﺎ ﻛﺎن ﻳﺴﻤﻰ ﻗﺒﻞ ﺑﻀـﻊ ﺳـﻨﻮات " ﻣﺸـﻜﻠﺔ ا ﺠـﺮة ا ﺒﻜـﺮة ا ﺴﺘﺤﻴﻠﺔ . ﻳﺘﻌﻠﻖ اﻷﻣﺮ ﺑﺤﻘﻴﻘﺔ أن ﻫﻨﺎك اﻵن ﻋﺪد ﻻ ﻳﺴﺘﻬ ﺎن ﺑﻪ ﻣﻦ ا ﺠﺮات ا ﻮﺟﻮدة ﺑﻌﺪ ﻣﺎ ﺑ 500 و 800 ﻣﻠﻴﻮن ﺳﻨﺔ ﻣﻦ اﻻﻧﻔﺠﺎر اﻟﻌﻈﻴﻢ ﺗﻈﻬﺮ أﻗﺮاص وﻫﺎﻻت ﻣﺸﺎﺑﻬﺔ