The galaxy in the photo is m87 , a typical elliptical galaxy :圖中的是m87星系,是一個典型的橢圓星系。
Elliptical galaxies range in shape from almost perfect spheres to flattened globes 橢圓星系的外形范圍從幾乎完美的球體到壓扁的球。
Elliptical galaxies do not take on the flat - disk or spiral shapes that most galaxies do 橢圓星系并不具有大多數星系具有的扁圓或是螺旋型的形狀。
Spiral galaxies contain both young and old stars . in general , they are brighter than elliptical galaxies :旋渦星系同時擁有年老和年青的恒星,它們通常比橢圓星系光。
In the specific model we developed , elliptical galaxies have roughly equal numbers of each type 在我們所發(fā)展出的模型里,這兩類星團在橢圓星系中的數量大致上是差不多的。
The light from an elliptical galaxy is brightest in the center and gradually becomes fainter toward its outer regions 從橢圓星系發(fā)出的光在中心部分最亮越靠近邊緣越暗淡。
Taking the famous m87 elliptical galaxy as example , the dark matter in its core runs up to 2 . 4 billion solar masses 其中最著名的m87橢圓星系,其核心的黑暗質量竟達24億太陽質量!
As far as astronomers can determine , elliptical galaxies rotate much more slowly than spiral galaxies or not at all 直到天文學家能夠測定,橢圓星系自轉要比旋渦星系慢的多或者根本不旋轉。
Elliptical galaxies have much less dust and gas than spiral galaxies have , and few new stars appear to be forming in them 橢圓星系中的氣體和塵埃比旋渦星系要少得多,貌似其內部也少有恒星誕生。
At least some elliptical galaxies , as well as the bulges and halos of spiral galaxies , may have arisen from such collisions 至少螺旋星系的核球與暈,以及某些橢圓星系,可能是由此種碰撞產生的。