# What is the mass of the moon?

Of all the parameters of celestial bodies, mass is the most difficult to calculate. Therefore, unlike diameter, the mass of the moon was calculated relatively recently.+

Among the satellites of the Solar System, the Moon is in sixth place by mass. Its mass is 7.34x1022 kg, which is 80 times less than the earth. It is possible to calculate the average density of the moon - 3.35 g / cm3, which is 3-4 times higher than that of other satellites (except Io - the satellite of Jupiter ), as well as the acceleration of gravity - 1.62 m / s2, and gravity, which is 1/6 of the earth, that is, an object moved from Earth to its satellite would weigh six times less. Due to the weak attraction, the moon has no atmosphere. ## Gravitational influence of the moon

The moon is an abnormally large and massive satellite, so it has a tangible gravitational effect on the planet. The main manifestation of this effect is the ebb and flow.
Along the axis of the Moon - Earth, tidal forces arise. The closer the piece of Earth to the moon, the more strongly it is attracted to it. Different degrees of attraction at different points cause the deformation of the globe, resulting in sea tides. ## Watch the video on the topic

As a result, the gravity of the moon affects the earth's crust, atmosphere and hydrosphere of the earth and even its geomagnetic field.
The Earth and the Moon form a single mass system, the center of which is located at a distance of 4750 km from the center of the Earth

## How to measure

Newton was the first to try to calculate the mass of the moon using measurements taken during high tides, but he got a result that was twice the true value. They could correctly calculate the mass of the satellite after Cavendish experimentally determined the exact value of the gravitational constant