Astronomers know that Pluto and Triton have nearly the same size, mass, and density.

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。

Now astronomers think it was a meteor that burned up high in the atmosphere.

现在天文学家认为那是一颗在高空燃烧的流星。

Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.

天文学家在距离地球不远处发现一颗小行星，它与地球在同一轨道上围绕太阳运行。

A team of astronomers working at the European Southern Observatory in Chile, led by Simon Clark, spotted a flyer in the cosmos.

在智利的欧洲南方天文台，由西蒙·克拉克领导的天文学家团队发现了宇宙中的一个飞行物。

The latest research will help astronomers distinguish between the two sources of methane in their search for extraterrestrial life.

这项最新发现将帮助天文学家在寻找外星生命过程中辨别两种来源不同的甲烷。