| 1. | The 100 billion stars of this galaxy are chiefly located in two spiral arms that extend from the nucleus .
这个星系所属的1000亿颗恒星主要分布在从核心伸展出来的两条旋臂上。 |
| 2. | Stars are born in these interstellar clouds, which are located in the spiral arms of our milky way galaxy
在我们银河系里，恒星就是在位于银河系旋臂上的这种星际气云中产生的。 |
| 3. | The mostly accepted theory of the spiral arms is the
最广为天文学界所接受的说法是 |
| 4. | Our sun is on the orion spiral arm , about two - third from the center
太阳位于银河系的猎户臂，距离银心约为半径的三分之二。 |
| 5. | Spiral arm tracer
示臂天体 |
| 6. | Suppose a spiral arm rotated around the center of its galaxy in about 250 million years - - as in the milky way
假设一条旋臂绕其星系中心一周大约2 . 5亿年，就像银河一样。 |
| 7. | In order to trace out the spiral arms , we could search for the hydrogen , which is abundant in the spiral arms
为了把旋臂的结构勾勒出来，方法是找出旋臂中特别丰富的氢气分布情况。 |
| 8. | Our distant sun cannot be seen here , but it is in the center of the image , near the border of one spiral arm
我们遥远的太阳在这里还看不到，但它在这幅图的中心，靠近一条旋臂的边缘。 |
| 9. | It is difficult to detect the spiral arms in our galaxy because 1 we are inside the galaxy and 2 the gas and dust , which form
我们身处在银河系中，不能从远方把银河系结构看清楚散布在银河系中的大量气体尘埃 |
| 10. | This makes space telescope invaluable for identifying a rare class of pulsating stars , called cepheid variable stars embedded within m100 ' s spiral arms
这对于从m100的旋臂中分辨出暗藏的造父变星有着莫大价值。 |
