Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
중성자성은 매우 높은 밀도를 가진 천체입니다.jungseongjaseong-eun maeu nop-eun mildeul-eul gajin cheonche-imnida.A neutron star is a celestial body with a very high density.