sci fi gravity query

[kratos_GOW]

So I was watching Independence Day yesterday and they say the alien mother ship is roughly 800 km in length and has a mass 1/4 of our moon. So I was thinking an object of that size should have its own gravity but I could see that a species of that intelligence would probably be able to prevent objects from gravitating toward it. My question is lets say for some reason that ship were abandonded for a long period of time, could its gravitational pull draw in smaller objects such as meteors and eventually turn the ship into a "cellestial body" that might look something like a moon.

 

[crazyeddie]

So I was watching Independence Day yesterday and they say the alien mother ship is roughly 800 km in length and has a mass 1/4 of our moon. So I was thinking an object of that size should have its own gravity but I could see that a species of that intelligence would probably be able to prevent objects from gravitating toward it. My question is lets say for some reason that ship were abandonded for a long period of time, could its gravitational pull draw in smaller objects such as meteors and eventually turn the ship into a "cellestial body" that might look something like a moon.

Only if it orbited in an area of the solar system that has not already been swept clean by existing planetary bodies. It would gather a small amount of mass from random collisions with comets, meteors and small asteroids if it was in Earth orbit, but it would have to be in the asteroid belt, the Kuiper belt, or the Oort Cloud in order to gain any significant amount of mass.

 

[kratos_GOW]

Ok so if the ship were abandoned in an early forming star system with lots of lose materials about it could draw these materials in to basically turn it into a celestial body and then it could be drawn in by a larger forming planet and become its moon.

 

[StarRider1701]

You forget that size has little to do with gravity. MASS determines the amount of gravitiic force a body exerts and the mothership was hollow. Very little mass compared to solid bodies of the same size.
Did they turn the power off when they abandoned it? If not then it would still have shields that would prevent any collisions with outside bodies. Personally, I think I would leave the shields on, especially if I thought I (or my descendants) would be coming back.