A planetary life.
游荡的生活
Just as the planets revolve about the sun, planetary electrons are thought of as revolving about the nucleus.
正像行星围绕太阳转一样，行星般的电子被认为是围着原子核转的。
One of the four brightest satellites of Jupiter and the sixth in distance from the planet. Originally sighted by Galileo, it is the largest planetary satellite.
卡利斯托卫星木星最亮的四颗卫星之一，是距木星第六远的卫星。最初为伽利略所发现，它是最大的行星卫星
