例如，电波天文学提供了宇宙微波辐射的观察，而能够探测宇宙之边缘。

For instance, radio astronomy allows observations of cosmic microwave radiation, thus offering a way of detecting the edge of the universe.

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从可见光扩展到无线电波，再到 X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。

The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.

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它们紧随宇宙伊始而形成，并因类星体是巨大的无线电波发射源而进入天文学家的视野。

These formed shortly after the universe began and they came to the attention of earthling astronomers because quasars are powerful radio sources.

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