From the SETI blog at scienceblogs:
"These very flat systems are fully consistent with our classic model of how planetary systems form. A protoplanetary disc, basically a disc of dust and gas, collapses and becomes flatter and flatter and spins faster and faster. The innermost part of that disc collapses gravitationally to form the central star, or the sun. Fragments then clump together in the outer part and those fragments stick together and collide and stick to grow and create the planets."
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