In the case of this mega-maser, the light was emitted when the universe was very young — about 10% of its current age.
在宇宙还是很年轻(大约是它目前年龄的10%)的时候,光线从这座巨型脉泽中发出。
Tungsten light bulbs cast very yellow light. And any surface that light bounces off can add its color.
钨丝灯光明显偏黄,而且反射这种光线的表面也会呈现出相应的颜色。
By looking very far away, because the light takes so long on its journey to reach the Earth, astronomers are effectively able to look back in time to this early era.
由于观测距离很远,光线要花很长时间才能到达地球,天文学家才能在现代观察到遥远的过去的景象。
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