RE: Only one neutron star equals earth weight? - نجم نيوتروني واحد فقط يساوى وزن الارض ؟

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Only one neutron star equals earth weight? - نجم نيوتروني واحد فقط يساوى وزن الارض ؟

in discovery •  7 years ago 

الفكرة جميلة

discovery
7 years ago by

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