Making waves isn’t conducive to staying asleep, at least when the waves are a type of brain signal associated with being awake. A type of brain activity known as an alpha wave emanates from the back of the head when a person is awake but relaxing with eyes closed. Scientists used to think that the wave was subdued and disappeared as a person fell deeper and deeper into sleep. But the alpha wave... 

The sun-orbiting SOHO spacecraft has imaged many erupting filaments lifting off the active solar surface and blasting enormous bubbles of magnetic plasma into space. This image shows the sun in ultraviolet light, while the field of view extends over 2 million kilometers, or 1.243 million miles, from the solar surface.While hints of these explosive sun storms, called coronal mass ejections or CMEs,... 

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A cave is a natural underground void large enough for a human to enter. Some people suggest that the term cave should only apply to cavities that have some part that does not receive daylight; however, in popular usage, the term includes smaller spaces like sea caves, rock shelters, and grottos. Most caves are formed in limestone by dissolution. Speleothems in Hall of the Mountain King, Ogof... 

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