If a Mars-sized object collided with the Earth,then why did it formed our Moon?

Question

If a Mars-sized object collided with the Earth,then why did it formed our Moon?

a person sent me an email that if this theory was true,it couldnt have been as the debris can't clump together and then Earth will have rings like the other gas giants.and also he said that if that's possible,all of the gas giants' moons(e.g.Ganymede,Titania)
were materials of the Jovian planets rings.

Answer 1

According to a program that I saw on TV, it depends on the angle that the Mars-sized object hits the Earth. If it hits at enough of an oblique angle, the physics works.

Answer 2

The material most certainly CAN clump together as evidenced by the existence of all the planets! Computer simulations have confirmed that this can happen and moon rocks brought back by the Apollo astronauts support the theory. This theory is widely accepted by scientists.

Answer 3

I LEAN IN THE DIRECTION OF THE EARTHS GRAVITATIONAL CAPTURED IT WAY BACK WHEN. If a Mars size object collided with with earthe you would end up with an asteroid debris field orbiting the sun.

HOW FAST IS THE MARS LIKE OBJECT TRAVELING, WHAT ABOUT THE GRAVITATIONAL INTERACTIONS,

THE MOON HAS CLEARLY BEEN BOMBARDED BY SOME LARGE OBJECTS, YET THERE ARE NO OTHER MOON LIKE BODIES ORBITING EARTH...DITTO THE MOON... FOR EARTH

Answer 4

Debris *can* accrete, and if the mass is large enough, it will form a near-sphere. An impact between planet-sized objects will *melt* the objects. It is easy to conceive of melted masses forming huge droplets under the forces of gravity in space.

Answer 5

it was a large mass of magma that was ejected from earth do to the object impacting at an off angel (not straight on) the magma cooled becoming the moon we see today..

Answer 6

You have a good point. I heard that theory too of how our moon was formed, but I'm not sure I buy it.