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The cosmic age problem is a historical problem in astronomy concerning the age of the universe. The problem was that at various times in the 20th century, some objects in the universe were estimated to be older than the time elapsed since the Big Bang, as estimated from measurements of the expansion rate of the universe known as the Hubble constant, denoted H0. (This is more correctly called the Hubble parameter, since it generally varies with time).If so, this would represent a contradiction, since objects such as galaxies, stars and planets could not have existed in the extreme temperatures and densities shortly after the Big Bang.

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  • مشكلة العمر الكوني (ar)
  • Cosmic age problem (en)
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  • مشكلة العمر الكوني هي مشكلة تاريخية في علم الفلك تتعلق بعمر الكون. وسبب المشكلة هو التناقض الذي ظهر في أوقات مختلفة في القرن العشرين، حيث قدرت بعض أعمار الأجرام في الكون بأنها أقدم من الوقت المنقضي منذ الانفجار العظيم،كما تم تقديرة من قياسات معدل توسع الكون المعروف باسم ثابت هابل. منذ قرابة عام 1997-2003، يعتقد أن المشكلة قد حلها معظم علماء الكون: فالقياسات الحديثة تقود إلى تقدير دقيق لعمر الكون (أي الوقت منذ الانفجار العظيم) قدرة 13.8 مليار سنة، والتقديرات العمرية الأخيرة لأقدم الأجرام الفلكية هي إما أصغر من ذلك، أو منسجمة مع هذا العمر. (ar)
  • The cosmic age problem is a historical problem in astronomy concerning the age of the universe. The problem was that at various times in the 20th century, some objects in the universe were estimated to be older than the time elapsed since the Big Bang, as estimated from measurements of the expansion rate of the universe known as the Hubble constant, denoted H0. (This is more correctly called the Hubble parameter, since it generally varies with time).If so, this would represent a contradiction, since objects such as galaxies, stars and planets could not have existed in the extreme temperatures and densities shortly after the Big Bang. (en)
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  • مشكلة العمر الكوني هي مشكلة تاريخية في علم الفلك تتعلق بعمر الكون. وسبب المشكلة هو التناقض الذي ظهر في أوقات مختلفة في القرن العشرين، حيث قدرت بعض أعمار الأجرام في الكون بأنها أقدم من الوقت المنقضي منذ الانفجار العظيم،كما تم تقديرة من قياسات معدل توسع الكون المعروف باسم ثابت هابل. منذ قرابة عام 1997-2003، يعتقد أن المشكلة قد حلها معظم علماء الكون: فالقياسات الحديثة تقود إلى تقدير دقيق لعمر الكون (أي الوقت منذ الانفجار العظيم) قدرة 13.8 مليار سنة، والتقديرات العمرية الأخيرة لأقدم الأجرام الفلكية هي إما أصغر من ذلك، أو منسجمة مع هذا العمر. (ar)
  • The cosmic age problem is a historical problem in astronomy concerning the age of the universe. The problem was that at various times in the 20th century, some objects in the universe were estimated to be older than the time elapsed since the Big Bang, as estimated from measurements of the expansion rate of the universe known as the Hubble constant, denoted H0. (This is more correctly called the Hubble parameter, since it generally varies with time).If so, this would represent a contradiction, since objects such as galaxies, stars and planets could not have existed in the extreme temperatures and densities shortly after the Big Bang. Since around 1997–2003, the problem is believed to have been solved by most cosmologists: modern cosmological measurements lead to a precise estimate of the age of the universe (i.e. time since the Big Bang) of 13.8 billion years, and recent age estimates for the oldest objects are either younger than this, or consistent allowing for measurement uncertainties. (en)
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