天文学家们知道冥王星和海王卫一拥有几乎相同的体积、质量和密度。
Astronomers know that Pluto and Triton have nearly the same size, mass, and density.
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.
这是一颗已经爆炸的恒星的残骸，这颗星可能早在公元185年就被中国的天文学家观测到过。
It is the remains of an exploded star, which may have been observed on Earth in 185ad by Chinese astronomers.
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