dark halo crater

dark halo crater

A small lunar crater, originally believed to be volcanic (e.g. a cinder cone or fumarole) but now considered to be produced when an impacting meteorite excavates dark surface materials.
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For example, a small dark halo crater southeast of Copernicus is called Copernicus H.
Another classic dark halo crater is just southeast of Copernicus.
Can you identify the origin of each dark halo crater you happen to see?
These are among the most observationally interesting craters on the Moon because their floors are cut by concentric fractures and ridges, and they often contain rilles, dark halo craters, and ponds of lava.
These small pits, known as dark halo craters, excavated underlying mare lavas and spread them as pulverized debris on top of the ray.
Similar volcanic, dark halo craters also appear on the floor of Atlas.
The Moon also has some small-scale volcanic features--sinuous rilles, dark halo craters, and domes (July issue, page 20).
For example, gentle-sloped volcanic domes pop into view with grazing illumination, and dark halo craters become visible under a high Sun.
Features like this occur on the floor of Alphonsus and other craters--we call them dark halo craters.
Most mare surfaces have sinuous rilles, volcanic domes, and dark halo craters (the Moon's equivalent of cinder cones).
He says the dark halo craters on the floor of Alphonsus are not well understood but were probably formed by small lava-flow eruptions, miniature versions of the great outpourings that emplaced mare lava.
Models of small volcanic eruptions under lunar conditions (low gravity and no air resistance) nicely match the observed low cones and broad ash patterns of the dark halo craters in Alphonsus.