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Fuzzy cold dark matter is a hypothetical form of cold dark matter proposed to solve the cuspy halo problem. It would consist of extremely light scalar particles with masses on the order of ≈ 10 − 22 {\displaystyle \approx 10^{-22}} eV; so a Compton wavelength on the order of 1 light year .
The cuspy halo problem (also known as the core-cusp problem) is a discrepancy between the inferred dark matter density profiles of low-mass galaxies and the density profiles predicted by cosmological N-body simulations. Nearly all simulations form dark matter halos which have "cuspy" dark matter distributions, with density increasing steeply at ...
A circumscribed halo (outer ring) together with a comparatively rare 9° halo (inner ring), caused by pyramidal ice crystals. Midsland, the Netherlands, 2019. 22° halo around the Sun, above VBHC Serene Town at Bangalore, India, on May 24, 2021, at 12:15 pm
The stellar halo is a nearly spherical population of field stars and globular clusters.It surrounds most disk galaxies as well as some elliptical galaxies of type cD.A low amount (about one percent) of a galaxy's stellar mass resides in the stellar halo, meaning its luminosity is much lower than other components of the galaxy.
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22° halo around the Sun 22° halo around the Moon. 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.
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343 Guilty Spark, also known as just Spark, is a character in the military science fiction Halo franchise. 343 Guilty Spark plays a major role in the storyline of the original Halo video game trilogy: the character appears in Halo: Combat Evolved, Halo 2, and Halo 3, as well as the remakes of the first two games, Halo: Combat Evolved Anniversary, and Halo 2: Anniversary. 343 Guilty Spark is ...
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