Earth Science
Senior High
想問這題怎麼算
X 50.若有一顆距離地球約 4.0x10^13公里的恆星,視星等為11等。如果
將此顆恆星移至距地球約4.0x10^5 公里遠的月亮的位置,此恆星的視星
等變為多少?(用阿拉伯數字填數值即可)
*.../4
-9
正確答案
-29
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