: If i put measuring equipment(weighing machine) under of my feet, at earth, machine shows about 80kg.

At moon it shows at about 30kg or etc.

At space is shows 0kg, like spacecraft. I flow.

I ask;

What is weight of moon? Which direction of moon i put weighing machine, to measure weight of moon. Or what is weight of earth. Which direction i put weighing machine to measure weight of earth.

What i mean.

At space, moon, earth, sun, example, dont have weight, to any direction.

So, how can gravity keep planets together?

Earth weight is very light, when i look it from sun. It means that example sun-light has so much lightpower to keep earth to same position, push-pull.

Put i dont understand, which keep earth to rotation movement, round of sun?

Sorry my english. Hello.