The Moon is shrinking. But only very slightly – by about 50m (164ft) in radius over the last several hundred million years. Mysterious seismic activity, known as moonquakes, could be to blame.
100 Mind-Blowing Radius Facts
1 tsp of neutron star weighs the same as the human population. A neutron star’s density is mind-boggling. These stars are composed almost entirely of neutrons packed together in a tiny radius. Just a teaspoonful of this material would weigh over a trillion kilograms — more than the weight of the entire human population (which reaches a few hundred billion kilograms). To make something as dense as a neutron star, the whole of humanity would need to be crammed into a space the size of a sugar cube.