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AVIATR is Barnes’s concept for an aerial drone powered by two small nuclear generators (known as Advanced Stirling Radioisotope Generators, or ASRGs) that could stay airborne over Titan pretty much indefinitely. The ASRGs together would only provide about 250 watts, or enough to power two light bulbs. But Titan makes flying easy and non-energy-intensive--it exerts seven times less gravity than Earth and hosts an atmosphere that’s three times denser.
