We've got all of this material blasted outward in a single burst accelerated into a void wherein there is no matter or mass to impede the free travel of the effluvia; the temperature is unimaginably high and the "space" in which it finds itself is what? - absolute zero?
Now, the gaseous matter must cool and then condense to form the dust of which you speak; but, in order for it to accrete, would it not need a locus of matter about which to gather?
If, at the very moment of "explosion" the greater masses were accelerated at a slower rate than the rest would there then be lines (arcs?) of separation among them?
Currently, the greatest masses are composed of the lightest element - hydrogen fusing to energy, called suns, right?
How did all the hydrogen come together to form suns and did it then, having bodies of great mass "recall" the rest of the now condensed matter about it to form planets and smaller solid non-incandescent bodies?
Or, in the "Big Bang," did all the heavy mass suddenly get thrown clear of the hydrogen leaving it to dart here and there and come to "rest" violently fusing as it slowed?
Or, is this just above my puny mind?