What force holds objects up?

No force holds objects up.

Gravity causes objects to attract each other, which makes it look like objects fall to the earth.

Objects in orbit stay in orbit because their velocity tangential to the object they orbit is sufficient to cause their falling due to gravity to bend into a continuous free fall.
No force holds objects up.

Gravity causes objects to attract each other, which makes it look like objects fall to the earth.

Objects in orbit stay in orbit because their velocity tangential to the object they orbit is sufficient to cause their falling due to gravity to bend into a continuous free fall.