Intercalary month The term has traditionally referred to an "extra" full moon, where a year which normally has 12 full moons has 13 instead.
Its composition is not well defined, but is probably metallic iron alloyed with a small amount of sulfur and nickel; analyses of the Moon's time-variable rotation suggest that it is at least partly molten. Volcanic features Lunar nearside with major maria and craters labeled The dark and relatively featureless lunar plains, clearly seen with the naked eye, are called maria Latin for "seas"; singular mareas they were once believed to be filled with water;  they are now known to be vast solidified pools of ancient basaltic lava.
Although similar to terrestrial basalts, lunar basalts have more iron and no minerals altered by water. Several geologic provinces containing shield volcanoes and volcanic domes are found within the near side "maria". This raises the possibility of a much warmer lunar mantle than previously believed, at least on the near side where the deep crust is substantially warmer because of the greater concentration of radioactive elements.
They have been radiometrically dated to having formed 4. Although only a few multi-ring basins have been definitively dated, they are useful for assigning relative ages. Because impact craters accumulate at a nearly constant rate, counting Moon micro number of craters per unit area can be used to estimate the age of the surface.
The finer regolith, the lunar soil of silicon dioxide glass, has a texture resembling snow and a scent resembling spent gunpowder.
A secondary cratering process caused by distal ejecta is thought to churn the top two centimetres of regolith a hundred times more quickly than previous models suggested—on a timescale of 81, years.
Lunar swirls Lunar swirls are enigmatic features found across the Moon's surface.
They are characterized by a high albedo, appear optically immature i. Their shape is often accentuated by low albedo regions that wind between the bright swirls.
Presence of water Main article: Lunar water Liquid water cannot persist on the lunar surface. When exposed to solar radiation, water quickly decomposes through a process known as photodissociation and is lost to space.
However, since the s, scientists have hypothesized that water ice may be deposited by impacting comets or possibly produced by the reaction of oxygen-rich lunar rocks, and hydrogen from solar windleaving traces of water which could possibly persist in cold, permanently shadowed craters at either pole on the Moon.
However, later radar observations by Arecibosuggest these findings may rather be rocks ejected from young impact craters.
The spectrometer observed absorption lines common to hydroxylin reflected sunlight, providing evidence of large quantities of water ice, on the lunar surface. The inclusions were formed during explosive eruptions on the Moon approximately 3. This concentration is comparable with that of magma in Earth's upper mantle.
Although of considerable selenological interest, this announcement affords little comfort to would-be lunar colonists—the sample originated many kilometers below the surface, and the inclusions are so difficult to access that it took 39 years to find them with a state-of-the-art ion microprobe instrument.
Analysis of the findings of the Moon Mineralogy Mapper M3 revealed in August for the first time "definitive evidence" for water-ice on the lunar surface.
Gravity of the Moon GRAIL 's gravity map of the Moon The gravitational field of the Moon has been measured through tracking the Doppler shift of radio signals emitted by orbiting spacecraft.
The main lunar gravity features are masconslarge positive gravitational anomalies associated with some of the giant impact basinspartly caused by the dense mare basaltic lava flows that fill those basins. There are some puzzles: Magnetic field of the Moon The Moon has an external magnetic field of about 1— nanoteslasless than one-hundredth that of Earth.
The Moon does not currently have a global dipolar magnetic field and only has crustal magnetization, probably acquired early in its history when a dynamo was still operating.
This is supported by the apparent location of the largest crustal magnetizations near the antipodes of the giant impact basins.A blue moon is an additional full moon that appears in a subdivision of a year: either the third of four full moons in a season, or a second full moon in a month of the common calendar..
The phrase has nothing to do with the actual color of the moon, although a literal "blue moon" (the moon appearing with a tinge of blue) may occur in certain atmospheric conditions: e.g., if volcanic eruptions.
A Micromoon happens when a Full Moon or a New Moon coincides with apogee; the point in the Moon's orbit farthest away from Earth.
It's also known as Micro Full Moon and Apogee Moon. A travel guide to Micronesia by David Stanley, author of Moon Handbooks South Pacific. The LED Starry copper wire String Lights composed of Bright White Warm Color Micro LEDs that don't overheat giving a light fairy effect.
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A Micro Moon is the phenomenon where the moon is a “Full Moon” and is at its farthest point from earth during its yearly orbit, resulting in the appearance of a smaller and dimmer than normal moon (at least from our viewpoint).