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In 2019, a reanalysis of nearly 50 years of data collected from the Lunar Laser Ranging experiment with lunar gravity field data from the GRAIL mission, shows that for a relaxed lunar fluid core with non-hydrostatic lithospheres, the core flattening is determined as (2.2 ± 0.6) × 10 −4 with the radii of its core-mantle boundary as 381 ± 12 km.
be re-implanted into the regolith as a result of the Moon's gravity; escape the Moon entirely if the particle is moving at or above the lunar escape velocity of 2.38 km/s (1.48 mi/s), or 5,328 mph (8,575 km/h); be lost to space either by solar radiation pressure or, if the gases are ionized, by being swept away in the solar wind's magnetic field.
The Moon has a solid iron-rich inner core with a radius possibly as small as 240 kilometres (150 mi) and a fluid outer core primarily made of liquid iron with a radius of roughly 300 kilometres (190 mi). Around the core is a partially molten boundary layer with a radius of about 500 kilometres (310 mi).
The internal structure of the Moon was characterized in 1974 using seismic data collected by the Apollo missions of moonquakes. [11] The Moon's core has a radius of 300 km. [12] The Moon's iron core has a liquid outer layer that makes up 60% of the volume of the core, with a solid inner core. [13]
Source: NASA Armstrong took the photo with a 70mm lunar surface camera while the two explored a region of the moon known as the "Sea of Tranquility.". At an event promoting his new book, No Dream ...
Surveyor 7 observes levitating dust. There is some evidence that the Moon has a tenuous layer of moving dust particles constantly leaping up from and falling back to the Moon's surface, giving rise to a "dust atmosphere" that looks static but is composed of dust particles in constant motion.
The geology of the Moon (sometimes called selenology, although the latter term can refer more generally to "lunar science") is quite different from that of Earth. The Moon lacks a true atmosphere , and the absence of free oxygen and water eliminates erosion due to weather .
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