[astronomers]astronomer什么意思

11 Astronomers know that Pluto and Triton have nearly the same size， mass， and density天文学家知道冥王星与海卫一拥有几乎相同的体积质量与密度12 Sony has also led the way in shrinking the size of。

As a famous Neptune， he， he is not observed， but calculate out of 19th century， astronomers have discovered some rules of operation Uranus， they suspect a planet in quottimequot， continuously， people finally got this planet。