That's because when the black hole first reaches and then exits the Earth's outer core, the outer core would vibrate, creating spherically symmetric shock waves. These would trigger every seismic detector on Earth at the same time – unlike regular earthquakes, which are more localised. read more
Hawking had gotten into an argument with Princeton University graduate student, Jacob Bekenstein, who suggested in his PhD thesis that a black hole’s entropy - the 'disorder' of a system, related to its volume, energy, pressure, and temperature - was proportional to the area of its event horizon. read more
In fact the odds of a black hole devouring our planet are estimated at one in a trillion. There are two predominant types of black hole in the universe. The first are supermassive black holes found churning at the centre of galaxies. read more
There is nothing in the mesosphere to scatter solar radiation. The sky appears blue at the surface due to the scattering of radiation by gases in the. read more