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- People had assumed that this was due to varying levels of tiny particles in the air – now research shows that the effect is actually mostly due to light reflected off the cloud and bouncing off the particles.
www.newscientist.com/article/dn16864-halo-effect-explains-brightest-patches-of-sky/'Halo effect' explains brightest patches of sky - New Scientist
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What happens when a halo expands?
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What causes reflex motion in the Milky Way stellar halo?
The appearance of a huge, perfectly circular halo round the sun in Mexico earlier this year sparked rumours of the impending end of the world. In reality, it was the product of sunlight being refracted through hexagonal ice crystals high in the atmosphere.
Apr 11, 2022 · The discrepancy between the two curves implies the presence of a halo of massive dark matter extending outside the boundary of the luminous matter. This dark matter causes everything in the galaxy to orbit faster than the observed matter alone could explain.
Using a metallicity calibration from SDSS photometry, they found that candidate halo stars with retrograde motion are more metal-poor than those with pro-grade motion, which indicates that the outer halo is more metal-poor than the inner halo.
Jan 19, 2022 · It is possible to get a halo with 90 degree tilt (halo plane in same plane as earth orbit). EDIT: earth gravity causes speedup and slowdown. When object is 'behind' earth the earth gravity works to pull object along, increasing its speed.
Dec 10, 2018 · Halos are the result of a long sequence of cosmic structure formation. Cosmic archaeology tells us that halos formed something like this: The early Universe, after a very short period of rapid expansion called inflation, settled into its current phase of more leisurely general cosmic expansion (or "Hubble flow," as cosmologists often call it).
Apr 21, 2021 · The map in the right panel shows the model after the selections have been applied. The proper motion selection has a minor effect on the spatial distribution of the smooth model.
Mar 30, 2009 · This seemingly innocuous finding could have a surprisingly big knock-on effect because it means there may be fewer cooling particles in the sky than previously thought.
