Question

怎样给一个好朋友回一封鼓励他和朋友好好在一起的英语作文

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Answer 1

ixed and immobile.. So Harbert was forced to measure the distance with an indirect measure.. As is known to all, the star table view brightness decided by two factors: how much light is emitted (its absolute magnitude) and how far away from us. For nearby stars, we can measure the apparent brightness and distance, so we can calculate the absolute brightness of it. On the contrary, if we know the absolute brightness of stars in other galaxies, we can measure their table