What do other planetary systems look like? We have seen some where massive Jupiter-sized worlds orbit closer to their star than Mercury does to the Sun, baking them with radiation.  Others have had multiple rocky planets within the Earth’s orbit distance.  Some have planets similar to Earth in a variety of locations.  But what about far away from the star? We never expected to find gas giants like Uranus and Neptune in the far reaches of our solar system.  Are there planetary systems where planets live even farther away? Maybe there are planets that live in the empty darkness between stars,...