(0:34) April 16, 2012 - Described by NASA as "A beautiful prominence eruption producing a coronal mass ejection (CME)". Apparently it's an M1 class flare meaning it is medium sized. Bear in mind that a million Earths would fit into the sun, this medium sized flare is many times the size of Earth. Extremely powerful CMEs can pose a danger to astronauts and satellites in space, as well as power grids, navigation and communications systems on Earth.
You are welcome to
comment as a guest,
but registering gives you added benefits