And out of this information you get the radius, the velocity and the period, assuming that you are on Earth in the plane of the orbit of the stars.

除了这个，还能得到半径的大小，速度以及周期，假设你在地球上，和这些恒星环绕的，轨道同处一个平面。

youdao

Did you know that nowhere else in all the Universes, and among the thousands of galaxies and millions of stars and planets, are the animals as badly treated as they are here on this Earth?

你知道，在所有的宇宙中，在成千上万的星系中，在数百万恒星和行星上，没有任何地方的动物能与地球上动物所受的不公待遇相比吗？

youdao

Nuclear fusion - the melding of atomic nuclei that happens inside stars - is a long-sought goal on Earth.

核聚变是发生在恒星内部的原子核融合，是地球上长期追求的目标。

youdao

This peculiarly misconceived comedy stars Eddie Murphy in a dual role, as Dave, a humanoid spaceship that lands on Earth in order to move unnoticed among earthlings, and as the tiny outer-space homunculus who is its captain.

NEWYORKER: Meet Dave

If bursts occur within the Milky Way, the galaxy that contains the earth's solar system, they could be relatively small affairs quakes on the surfaces of neutron stars is one suggestion.

ECONOMIST: Astronomy

One recent study of more than 450 Sun-like stars within about 325 light-years of Earth indicated most had high iron content in their photospheres, or on their surfaces - again, evidence the stars had gorged themselves on planetary material.

BBC: Star 'eats' a planet