朗阁海外考试研究中心主任 宁园
astronomer astronomical astronaut
astrology observatory telescope
solar system cosmic rays cosmos
interstellar intergalactic galaxy
The Milky Way The Big Bang comet
asteroid satellite meteor
meteorite revolution rotation
radiation constellation cluster
lunar eclipse velocity
corona terrestrial planetary
exploration hypothesis assume
collision supernova nova
light year gravitation nebula
1 astronomer n. 天文学家
During his own tenure as astronomer royal, from 1720 to 1742, Halley studiously tracked the moon.
2 astronomical a. 天文学的, 天文数字的, 庞大的
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