I watched an old independent creature feature movie a few months ago called Magnetic Monster (1953). During a criminal investigation into bizarre radioactivity coming from a local appliance in which one dead body was recovered, they find evidence of an artificial radioactive isotope, serranium, being studied & modified by a scientist who they begin tracking down. Upon learning in horror that the scientist bombarded serranium with alpha particles for 200 hours they were told the radioactive isotope was beginning to grow and take a life of its own. The unstable isotope absorbs energy from its surroundings every 11 hours, with every cycle, it doubles in both size and mass, releasing deadly radiation and incredibly intense magnetic energy. OSI officials determine that, with its rate of growth, it will only be a matter of weeks before the isotope becomes heavy enough to affect the Earth's rotation on its axis, eventually causing it to break out of its orbit around the Sun, effectively destroying the entire world. Now governments and scientists have to work together to figure out how to stop it before the world is destroyed completely.