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Apart from the presence of ice-containing clouds in the right position in the sky, the halo requires that the light source (Sun or Moon) be very high in the sky, at an elevation of 58° or greater. This means that the solar variety of the halo is impossible to see at locations north of 55°N or south of 55°S.
A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk') [1] is an optical phenomenon produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky.
The Habitation and Logistics Outpost (HALO), [4] [5] also called the Minimal Habitation Module (MHM) and formerly known as the Utilization Module, is a habitation module that is part of the Lunar Gateway. [6] It will be built by Northrop Grumman Innovation Systems.
Rotor tip lights produce a visually similar but distinct effect. The effect is often and incorrectly believed to be an electrical phenomenon, either as a result of static electricity as in St. Elmo's Fire , or due to the interaction of sand with the rotor ( triboelectric effect ), or a piezoelectric property of quartz sand.
The momentum that is carried by light is capable of accelerating an object, even to relativistic speeds. A spacecraft using a halo drive would emit a stream of photons that would come within close proximity of a black hole that is in motion towards the spacecraft that is operating a halo drive.
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