The backgroundgalaxy is about the size of the Milky Way Galaxy and is about 10 times larger than the foreground galaxy .
背景星系大约与我们银河系相当，并大约10倍于前景星系。
2
The gravitational lens equations account for all the variables such as distance and density, and provide a better idea of when light left the backgroundgalaxy and how far it traveled.
引力透镜公式计算所有的变量，比如距离和密度，对光何时离开背景星系以及行走了多远的距离给出更好答案。
3
Kashlinsky and colleagues first noticed the dark flow when studying the way gas in galaxy clusters interacts with the cosmic microwave background radiation.