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Basically, it's an issue with the units. While a million tonnes is a lot on a personal level, it's tiny compared to a planet. For example, Pluto itself is 1.30900 * 1019 tonnes. A mere 106 tonnes of neutronium (or any substance) is going to change the mass of the planet by so little that it...
I agree on the mass issue. A million tonnes of something is a billion kilograms, or 10^9 kg. Plugging that into the gravitational force equation, that mass a meter away from you would cause an acceleration of about 6.7*10-11 * 109 = 0.067 m/s2. Something far enough away to be on the planet...