天文学外层空间事物的科学研究，尤指天体及天文现象的位置、大小、分布、运动、构成、能量及演化的科学
The scientific study of matter in outer space, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies and phenomena.
爱丁顿，阿瑟·斯坦利1882－1944英国数学家、天文学家和物理学家，相对论的早期拥护者，在星体演化、结构和运动方面有很深研究
British mathematician, astronomer, and physicist who was an early exponent of the theory of relativity and conducted research on the evolution, structure, and motion of stars.
在演化过程中一些鸟失去了飞行的能力。
In the course of evolution, some birds have lose the power of flight.
物种原形演化成后来各物种的真实存在的或假设的有机物
The actual or hypothetical organism or stock from which later kinds evolved.
