how was this planet formed
No. The moon formed after a planet-sized object collided with Earth.
Mercury
mercury
It captured gas.
No planet ever existed where the asteroid belt is. The mass is insufficient for a planet to have formed from all that debris.
Natural satellites are formed through various processes, such as gravitational capture, co-accretion, or collision. For example, moons can be captured in a planet's gravitational field, formed alongside their planet from the same material, or created through the collision of a planet with another celestial body, resulting in debris that forms a moon.
approximately, yes
i believe mercury
look some where else you bum
It is believed, hypothetically, that primitive life may have formed extra terrestrially on the planet Mars.
There is not believed to be a youngest or an oldest planet. They most likely formed simultaneously.
Because that is how the Solar system formed.