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 علماء الفلك يقولون إنهم حددوا حافة مجرة درب التبانة infographic
Graphic shows halo structure of the Milky Way.


علماء الفلك يقولون إنهم حددوا حافة مجرة درب التبانة

By Phil Bainbridge

January 10, 2023 - النجوم المكتشفة على حافة مجرتنا تبعد أكثر من مليون سنة ضوئية، وهي في منتصف الطريق تقريباً إلى مجرة المرأة المسلسلة (أندروميدا) المجاورة.

Using data from the Next Generation Virgo Cluster Survey they were able to detect 208 distant variable stars called RR Lyrae - old stars that because of their physical structure brighten and dim in a regular cycle of between 5 and 24 hours.

Because RR Lyrae have a uniform average brightness, it was possible to calculate the distance of the furthest star at around 1.04 million light years from the centre of the Milky Way, almost halfway to the Andromeda galaxy which is 2.5 million light years.

(1 light year = 9.461 trillion km)

PUBLISHED: 11/01/2023; STORY: Graphic News