Test out your new knowledge of the solar system's formation: put these events in the correct order. Click or tap on an event to select it, then click/tap again on a slot at the bottom to place it.


Solids and gases coagulate to form planetesimals


Planets form


Nuclear fusion begins and elements in the system condense into refractory materials


Planetary embryos form


Large cloud of gas and dust collapses, begins to rotate, and flattens; material within becomes denser


Gravity generated by planetesimals begins to affect surrounding materials

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