Keplorr is the uninhabitable planet which it orbit is the home to the planetoid Galileans.
Keplorr is a superheated planet which is considered hell, luckily the inhabitants don't live on the planet. The planet mostly consist of lava and volcanos as it have no solid surfaces on it. The planet have an unpredictable gravitational field which change many time. The planet is comparable to Jupiter to the fact it very large and have lots of satellites but hard to tell which is a living being in disguise.
Galilean are consider moons to the their home planet due to the fact that live in orbits, they never step foot the planet as the heat will destroy them, they will return home if they're off orbit.
Keplorr is currently destroyed by Malware and his Negative 10: nearly 288 Galileans survive their planet destruction. They want to orbits other planets but are afraid they may alter the planets' rotation so the Plumbers help them.

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Cinos' Plumber Database
FanfictionHere are the many Ben 10 related characters, location, and alien species that are part of my Sonic Expanded Universe. Notes: Not all of the Ben 10 characters are listed. Character owned by Cartoon Network, Warner Bros, and Man of Action.