Why is Jupiter so much bigger than the rocky planets?
Quick Answer
Jupiter formed early and far from the Sun, where there was plenty of gas and ice for it to accumulate. Its core grew large enough to capture huge amounts of hydrogen and helium.
The Full Story
Jupiter likely formed beyond the snow line, where temperatures were low enough for ices to stick together and build a massive core quickly. Once that core became large enough, it gravitationally attracted vast amounts of hydrogen and helium from the protoplanetary disk. That runaway growth made Jupiter far larger than Earth, Mars, Venus or Mercury. Jupiter's mass is more than twice the mass of all the other planets combined. Its size is one of the main reasons it strongly shapes the architecture of the Solar System.
Key Facts
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Suggested video title for this topic:
"Jupiter got so huge because it grabbed the Solar System’s leftover gas!"
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