Elon Mask is fascinated by space, so a Falcon 9 rocket launched by the Space X company on Tuesday night launched two US-based GRACE satellite satellites to detect all kinds of changes in Earth's water, sea level, melting To monitor ice and evaporation due to drought, etc.
The two subsequent events Gravity Recovery and Climate Experiment, each with a vehicle size of 220 km, will replace the older eponymous satellites, which were launched in 2002 and were included by 201
The new Joint Mission of the US Space Agency (NASA) and the GFZ German Research Center ($ 520 million) will monitor ocean, sea and river water Changes in the Water Cycle  Since the masses of water show movements and fluctuations, this leads to changes of gravity, which from satellites. The microwave instruments of the two satellites are so sensitive that they can detect water changes to an accuracy of about one micron (milliseconds), about one-tenth the width of a human hair.
Outside, the two young GRACEs resemble their predecessors, but they have a new instrument, an experimental laser interferometer that is ten times more accurate than the microwave instrument. If it works well, NASA wants to establish it.
The installation of the satellites was carried out by Airbus in Germany and the mission should last at least five years. In the future, Europe will be able to acquire its own GRACE satellites, thereby improving the Sentinel 6 mission.
With the same launch from the Vadenberg Air Force in California, five Iridium Next satellites were also launched, increasing their total to 55 to the future, with another 20 being launched to fill the number of 75.