天文學外層空間事物的科學研究，尤指天體及天文現象的位置、大小、分佈、運動、構成、能量及演化的科學
The scientific study of matter in outer space, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies and phenomena.
愛丁頓，阿瑟·斯坦利1882－1944英國數學家、天文學家和物理學家，相對論的早期擁護者，在星體演化、結構和運動方面有很深研究
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.
在演化過程中一些鳥失去了飛行的能力。
In the course of evolution, some birds have lose the power of flight.
物種原形演化成後來各物種的真實存在的或假設的有機物
The actual or hypothetical organism or stock from which later kinds evolved.
