On September 4, 2025, NASA’s Solar Dynamics Observatory (SDO) captured an incredible image of the Sun displaying a mysterious “S” shape, signaling an intense solar event that would trigger a ...

The sigmoid sinus is a dural venous sinus that lies deep within the human head, and just below the brain. A dural sinus is a channel that lies between the dura mater, the outermost tissue covering the ...

'Sigmoids' are S-shaped structures found in the outer atmosphere of the Sun (the corona), seen with X-ray telescopes and thought to be a crucial part of explosive events like solar flares. Now a group ...

A gigantic, backwards "letter S" recently appeared slap bang in the middle of the sun, moments before our home star unleashed a massive plume of plasma that later smashed into Earth, temporarily ...