英语首字母填空The moon travels around the earth once every month.It

英语首字母填空
The moon travels around the earth once every month.It is a satellite of the earth.A satellite is an object ,e____1 natural or man-made,t____2 in an orbit around another large one in space. Man-made sateelites arec____3 up into space by rockets.The speed of the rocket must r____4 28,440km/h,space by a rocket very fast second, it usually has very expensive c___5.It also has other things to make ekectricity from s___6.