The galaxy in the photo is m87, a typical elliptical galaxy :图中的是m87星系,是一个典型的椭圆星系。
elliptical galaxies range in shape from almost perfect spheres to flattened globes 椭圆星系的外形范围从几乎完美的球体到压扁的球。
elliptical galaxies do not take on the flat-disk or spiral shapes that most galaxies do 椭圆星系并不具有大多数星系具有的扁圆或是螺旋型的形状。
Spiral galaxies contain both young and old stars . in general, they are brighter than elliptical galaxies :旋涡星系同时拥有年老和年青的恒星,它们通常比椭圆星系光。
In the specific model we developed, elliptical galaxies have roughly equal numbers of each type 在我们所发展出的模型里,这两类星团在椭圆星系中的数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 从椭圆星系发出的光在中心部分最亮越靠近边缘越暗淡。
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椭圆星系,其核心的黑暗质量竟达24亿太阳质量!
As far as astronomers can determine, elliptical galaxies rotate much more slowly than spiral galaxies or not at all 直到天文学家能够测定,椭圆星系自转要比旋涡星系慢的多或者根本不旋转。
elliptical galaxies have much less dust and gas than spiral galaxies have, and few new stars appear to be forming in them 椭圆星系中的气体和尘埃比旋涡星系要少得多,貌似其内部也少有恒星诞生。
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与晕,以及某些椭圆星系,可能是由此种碰撞产生的。