What's the story behind mysterious "halos" of bare sand that surround coral reefs? When reefs are healthy an unusual phenomenon occurs: a perimeter of bare sand forms around the corals. These ...

Coral reef halos, also known as grazing halos or sand halos, are bands of bare, sandy seafloor that surround coral patch reefs. These features, clearly-visible from satellite imagery, may provide a ...

A group of cosmologists has calculated the properties of the universe’s first structures. Juerg Diemand, Ben Moore, and Joachim Stadel at the Institute for Theoretical Physics of the University of ...

A new study published inThe American Naturalist sheds light on the peculiar phenomenon of “grazing halos”—ghostly, vegetation-free rings surrounding coral reefs that are clearly visible in satellite ...

ROCHESTER, N.Y. — From time to time, it is worth taking a moment to look up at the sky as you may catch a glimpse of something unusual. Atmospheric optics can produce fascinating visual effects, many ...

Rebecca Stevenson explains sun halos and how to see them Sun halos and rainbows, one illusion is made from rain drops and the other is made from ice crystals. Halos are visible more often than ...