The cosmic microwave background radiation known as the ‘CMB’ is considered to have occurred about 14 billion years ago. Scientists concluded that they were looking at the signature of gravitational waves using a telescope located at the South Pole known as BICEP2.
Since 2000, scientists used satellites to map the Earth’s gravitational field. Recently, they have developed a new instrument which uses quantum phenomena for more accurate measurements. Altogether the mass of water is larger than any other component of the Earth. Therefore, the shifting mass of water is the biggest factor which contributes to a change in Earth’s gravity. Mass of a glacier or water trapped underground will be redistributed.