sentences: the neutrons pollution of a gravity will moving the same
docs: gravity has effect_of_pulling_things_down neutronium is neutron_matter. neutrons has spin fast_neutron is neutron. neutrons has about_as_much_mass_as_protons gravity is what_keeps_things_on_earth. gravity is property_of_matter. everything_with_mass has gravity neutron_star_matter is neutronium. neutron_bomb is atom_bomb.