IF a mass rich object like described would be visible in such a way we would meanwhile feel the gravimetrical effectswe had this topic already 1 year ago
the core of a star like that is heavy enough to kick out all planets of the solar system -> space-time (einstein layed down the facts)that would have happened meanwhile every 3600 years? the supernova is a possible event and very likely to happenits not the only one and nobody really knows when it will happenit is still far enough away to cause no harm at all