Astrophysics from the University Paris Diderot calculated exact mass of the Earth. For this they used a new method using cosmic neutrinos, which are constantly attacking the planet from outer space.
Reports mir24.tv a scan of the planet by cosmic rays showed that its total weight is 5,972E24 kg.
In the near future scientists are going the same way to know the mass of the nucleus of the Earth. At last count, the figure is 1,932·1024 kg, and accurate geological and chemical properties of the core of the planet is unknown to science.