B. Galaxies are made up of only stars. C. The Milky Way is the only galaxy. D. Gravity plays an important role in the universe. 相关知识点: 试题来源: 解析 D。A 选项黑洞不是完全黑的,错误。B 选项星系不仅由恒星组成,还有其他物质,错误。C 选项银河系不是唯一的星系,错误。D 选项重力在...
A. Milky Way B. Andromeda Galaxy C. Elliptical galaxy D. Irregular galaxy 相关知识点: 试题来源: 解析 A。解析:银河系(Milky Way)是螺旋状星系。选项 B 仙女座星系也是螺旋星系,但本题问的是哪个星系有螺旋形状,首先想到的通常是我们所在的银河系。选项 C 椭圆星系不是螺旋形状。选项 D 不规则星系也不...
A. It has a supermassive black hole at its center. B. It is a spiral - shaped galaxy. C. All the stars in it are of the same age. D. It contains dust and gas clouds. 相关知识点: 试题来源: 解析 C。解析:银河系是一个巨大的星系,它的中心有一个超大质量黑洞,它是螺旋状星系,并且包...
题目 3. Which of the following is the biggest? A.The Solar System B.The Milky Way Galaxy C.The Earth’s atmosphere D.The Sun 相关知识点: 试题来源: 解析B 四个选项分别是太阳系、银河系、地球大气层和太阳,它们从大到小的顺序是银河系>太阳系>太阳>地球大气层....
Of the 200 billion stars in the Milky Way galaxy, scientists find that five percent of the stars are like our sun. Perhaps half of them have a planet like the earth. Such a planet would be a reasonable distance from the star for the temperatures to be right for the evolution of lif...
in which stars and gas clouds exist mainly in its spiral “arms”第三段“Using 1,339 large, pulsating(脉冲的) stars to make a 3D map of the Milky Way, researchers discovered instead that the galaxy’s disk of stars is increasingly twisting, most likely due to the spinning of the disk....
Our galaxy, the Milky Way, is shaped like a flat disk surrounding a central bulge. Whereas Population I stars are found mainly in the galactic disk, Population II stars mostly reside in the central bulge of the galaxy and in the halo surrounding this bulge.Population II stars date to the ...
NASA's twin Voyager spacecraft have given astronomers their first direct look at emissions important for estimating the rate at which the Milky Way is making stars, opening a new avenue for studying star-forming regions in the galaxy.doi:10.1007/BF00199986Spotts, Pete...
a被我们称作银河的星系当中有两千多亿颗恒星 Is called as the Milky Way by us in the middle of the galaxy to have more than 2000 hundred million stars[translate]
drivers (2) What is the best title for Paragraph 2? A. The Age and Size of Earth. B. Our Galaxy: The Milky Way. C. Why Intelligent Life Might Exist. D. Earth: The Only Planet with Intelligent Life. (3) Why was it hard to look for signs of intelligent life in the universe in...