Where do dense rocks in space come from if there is no way for gravity to pull that small amount of matter...?

Question

...together into dense rock?

Answer 1

Some materials, like iron, are naturally dense.  And rocks form through accretion, where smaller rocks hit each other and stick together.

Answer 2

Do you mean like the iron rocks that form meteors? They usually come from bigger asteroids that have been smashed apart into smaller pieces by colliding with each other, or asteroids that have collided with a planet or moon, then the small chuncks flew off them. We think our asteroid belt came from a planet that got demolished. Gravity doesn't accrete small stuff. Others come from comets.

Answer 3

OOPs. Misunderstood the question.  Essentially, a dense object is formed through high pressure and or heat.  The solar system was very hot when it was first forming.  As it is though, most objects are collections of loosely held together fragments.

Gotta disagree there with the above statement.  Gravity does "accrete" small matter, an accidental "experiment" on a shuttle mission showed it action with small grains.  Gravity is at work wherever there is matter.

Answer 4

If you push something in space, it will keep going, forever, until it is stopped by an object in its path, because without gravity pulling it back, there is no way to stop it.

Its like falling into a literally bottemless pit, there is no way to stop or go back up unless you are pulled by a rope (gravity in this case) or unless you collide with an object on the way down.