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
천문학계의 연구자들은 새로운 별을 발견했다.cheonmunhakgyeui yeonguja-deul-eun saeroun byeol-eul balgyeonhaetda.Researchers in the astronomy community discovered a new star.