boolyo

http://book.naver.com/bookdb/book_detail.nhn?bid=6942158 응축원반 (accretion disk) 이미지 출처 : http://crab0.astr.nthu.edu.tw/~hchang/ga1/ch23-02.htm 통계시차 : http://sixdayscience.wordpress.com/curriculum/textbooks/chapter-11/