Far apart.
high sound particles are near, and low sound as far apart particles.
Usually yes, but the distance between the particles depends on pressure. A gas at high pressure can actually have particles fairly close together.
auroras
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Well actually the answer is Plasma. Plasma is lightning, Aurora Borealis, and fire are plasmas. Plasma's are particles that have broken apart. They form when high energy plasma go into the atmosphere.
Ozone, which blocks ultraviolet A and B high in the atmosphere, but is toxic to animal life when close to the ground.
Solar wind