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.
他们的天文学同僚们或许很乐意探索宇宙的边缘以寻找奇特的物质，比如黑洞、类星体和暗物质。
Their colleagues might be happy probing to the edge of the cosmos looking for exotic things like black holes and quasars and dark matter.
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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