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Halo (optical phenomenon) 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.
Near-rectilinear halo orbit (NRHO) in cislunar space, as illustrated by A.I. Solutions, Inc. using the FreeFlyer software. In orbital mechanics a near-rectilinear halo orbit (NRHO) is a halo orbit that passes close to the smaller of two bodies and has nearly stable behavior. [1] The CAPSTONE mission, launched in 2022, is the first spacecraft to ...
A halo orbit is a periodic, three-dimensional orbit associated with one of the L 1, L 2 or L 3 Lagrange points in the three-body problem of orbital mechanics. Although a Lagrange point is just a point in empty space, its peculiar characteristic is that it can be orbited by a Lissajous orbit or by a halo orbit.
A circumhorizontal arc is an optical phenomenon that belongs to the family of ice halos formed by the refraction of sunlight or moonlight in plate-shaped ice crystals suspended in the atmosphere, typically in actual cirrus or cirrostratus clouds. In its full form, the arc has the appearance of a large, brightly spectrum-coloured band (red being ...
A parhelic circle is a type of halo, an optical phenomenon appearing as a horizontal white line on the same altitude as the Sun, or occasionally the Moon. If complete, it stretches all around the sky, but more commonly it only appears in sections. [2] If the halo occurs due to light from the Moon rather than the Sun, it is known as a ...
22° halo. A 22° halo is an atmospheric optical phenomenon that consists of a halo with an apparent diameter of approximately 22° around the Sun or Moon. Around the Sun, it may also be called a sun halo. [1] Around the Moon, it is also known as a moon ring, storm ring, or winter halo. It forms as sunlight or moonlight is refracted by millions ...
The Habitation and Logistics Outpost (HALO), [4][5] also called the Minimal Habitation Module (MHM) and formerly known as the Utilization Module, is a scaled-down habitation module as part of the Lunar Gateway. [6] It will be built by Northrop Grumman Innovation Systems. [7][8] A single Falcon Heavy will launch HALO along with the PPE module ...
Halo: The Flood. Halo: The Fall of Reach is a military science fiction novel by Eric Nylund, set in the Halo universe, and acts as a prelude to Halo: Combat Evolved, the first game in the series. The book was released in October 2001 and is the first Halo novel. It takes place in the 26th century across several planets and locations.