The sun just released a burst of a rare form of helium known as helium-3 (3 He). What's peculiar is this lightweight, elusive isotope isn't usually seen in such high amounts. "This rare isotope ...

In this Solar Dynamics Observatory extreme ultraviolet image, the blue arrow marks a small bright point located at the edge of a coronal hole (outlined in red) that was the source of the helium-3 ...