halos

dwarf galaxy NGC1427A

Dwarf galaxies of Earth’s second closest galaxy cluster are free of dark matter halos

The standard model of cosmology suggests that a halo of dark matter particles surrounds most galaxies. However, this halo of dark matter is invisible, but its mass exerts a strong gravitational pull on galaxies in the vicinity. A new study by the University of Bonn (Germany) and the University of Saint Andrews (Scotland) challenges this …

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A large ring surrounds the sun in the sky accompanied by wispy clouds.

Mysteries of some atmospheric halos remain unexplained after 5,000 years

For the first time in almost 5,000 years of observations, researchers have fully cataloged optical illusions created in the sky as light shines through ice crystals known as atmospheric halos.  The atmospheric halo ‘inventory’ details frequently seen atmospheric optical illusions from known sources as well as shedding light on rarer halos, including ones with origins …

Mysteries of some atmospheric halos remain unexplained after 5,000 years Read More »