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Yes, there are many things that have a mass of greater than 8 kg that can fly. In fact, almost all conventional aircraft have masses that far exceed 8 kg. There is a classification of aircraft known as Ultralights that can be flown without a pilot's license because of how small they. Even these can have a mass of up to 115 kg. The smallest piloted aircraft, the Bumble Bee, still had a mass of 180 kg.