(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
一个
yī gèㄧ ㄍㄜˋ
a; an[cedict]
星球
xīng qiúㄒㄧㄥ ㄑㄧㄡˊ
celestial body (e.g. planet, satellite etc); heavenly body[cedict]
上
shàngㄕㄤˋ
on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]