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Solar systems and the planets within them form from the spinning disks of _____. Slowly, the grains of matter come together to form clumps, then boulders, and eventually balls big enough to have their own gravity _____. At this point, these clumped matter are called planetesimals. Eventually, the planetesimals grew larger by _____ and combining with other bodies of matter. As the planetesimals grew larger, their _____ was greater, and they collected even more matter. Some of the planetesimals began to _____ the main star. When they do this, they are considered to be a _____.

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