Ghostly

This “face” was seen in potential vorticity data from January 25, 1982, at a height of roughly 30 kilometers (18 miles), roughly the middle of the stratosphere. The “eyes” are areas of high potential vorticity and the “mouth” is an area of low potential vorticity. In the simplest terms, potential vorticity is a quantity that describes how air masses are spinningA pair of <span class="glossaryLink" aria-describedby="tt" data-cmtooltip="<div class=glossaryItemTitle>NASA</div><div…

An unseen ‘mirror world’ of particles that interacts with our world only via gravity may be key to solving the Hubble constant problem, according to new research.According to new research, an unseen ‘mirror world’ of particles that interacts with our world only via gravity might be the key to solving a major puzzle in cosmology today – the Hubble constant problem.The Hubble constant is the current rate of expansion of the universe. Predictions for this rate — from cosmology’s standard model — are significantly slower than…

If you're up high, and you listen carefully on nights when the northern sky dances with blazing sheets of green light – Earth's spectacular aurora borealis – you might hear some ghostly sounds.  Almost imperceptible, the sounds had only been heard during the wildest aurora displays, described as rushing sounds, like a waterfall at a distance, or popping and crackling like faint static.New evidence, however, suggests that the sounds take place high up in the atmosphere even when we can't hear them – even, perhaps, when we…