The European Space Agency has released a 3D model showing just how lumpy Earth’s gravity is. The data come from two years of observations by the GOCE satellite.
The model shows what the Earth would look like if the surface were fluid and gravity w
Indeed, it is. That's because it is an incomplete theory. We can observe it, we can study it, we can quantify it, we just can't identify it. Until we do the latter we cannot prove that it exists.
Edit: Until the 1700's when scientists started separating gases from air and proving that it was composed of observable matter the theory that 'air' existed and that it was composed of more than 'ether' was quite controversial.
Gravity is just a THEORY!
Indeed, it is. That's because it is an incomplete theory. We can observe it, we can study it, we can quantify it, we just can't identify it. Until we do the latter we cannot prove that it exists.
Edit: Until the 1700's when scientists started separating gases from air and proving that it was composed of observable matter the theory that 'air' existed and that it was composed of more than 'ether' was quite controversial.