A surface mass ejection (SME), depicted in this illustration, is a relatively recently discovered
phenomenon in stellar astrophysics. They are similar to coronal mass ejections but on a far larger
scale. During an SME, a star can release hundreds of billions of times more material than a coronal
event, equivalent to the mass of a small planet. This was first observed in the red supergiant
Betelgeuse in the constellation of Orion.
Surface Mass Ejection
Stars & Nebulae,