Problem w/ attaching MC in for loop

programming flash
1

(Flash 8)
Hi, this isn’t causing any adverse effects in my code, but is still confusing for me:

(this is the onClipEvent(Load) in the MC AsteroidsLoop)

for(i = 0; i < 1; i++) {
      _root.AsteroidsLoop.attachMovie("Asteroid", "Asteroid"+ i, 50000+i, {xPos:_root._width*Math.random(), yPos:_root._height*Math.random()});
}

for(i in _root.AsteroidsLoop) {
      trace(_root.AsteroidsLoop* + " " + i);
}

which traces:

1 i
_level0.AsteroidsLoop.Asteroid0 Asteroid0

And i don’t know what the “1 i” means or what movie clip it is.

All i am trying to do is get the first movieClip in AsteroidsLoop without knowing it’s instance name.
Also, i wish i could use _root.getNextHighestDepth() in place of 50000 + i, but i find that getNextHighestDepth() does not work consistently for me (in the case of the for loop it always returns 1).