a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center 同义词：spiral nebula,
A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.
例句与用法
1.
There is a curious feature in the spectra of spiral galaxies . 在旋涡星系的光谱中有一种奇妙的特征。
2.
Spiral galaxies are considered to be gravitationally bound configurations of stars . 旋涡星系被认为是由恒星组成的引力束缚系统。
3.
But almost all spiral galaxies are much older than 2 billion years 但是几乎所有旋涡星系的年龄都超过了20亿年。
4.
The mystery arises when one considers how a spiral galaxy rotates 当人们考虑旋涡星系是如何转动的时候难题就来了。
5.
New stars are constantly forming out of gas and dust in spiral galaxies 在旋涡星系中不断由气体和尘埃形成新的恒星。
6.
Ringed barred spiral galaxy 有环棒旋星系
7.
This spiral galaxy is called m81 which is about 11 . 7 million light years away 这旋涡星系名为m81 ，距离我们约有1 , 170万光年。
8.
Dwarf spiral galaxy 矮旋涡星系
9.
Barred spiral galaxy 棒旋星系
10.
Smaller groups of stars called globular clusters often surround spiral galaxies 称作球状星团的小型恒星团体经常环绕在旋涡星系周围。
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