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We do not really know the details of how we go from small grains of dust to massive gas giants, if we're able to catch them at their birth we can see where they form in the disk. This will allow us to better understand how many planets we would expect in a typical system. We can also examine what the chemical and molecular content of the gas is like around the protoplanet and build a picture of what atmospheres are like on very young planets. These results will provide essential evidence for theoreticians trying to fill in the gaps about how planets grow.