If Earth had been a few days earlier in its orbit around the sun two years ago, people could have been living in the Stone Age.
Scientists at NASA say in 2012, Earth narrowly avoided a direct hit from a coronal mass ejection — a solar flare, basically.
NASA explains coronal mass ejections, or CMEs, occur when huge bursts of energy launch material from the surface of the sun. If Earth's orbit takes it into the path of the CME, the charged plasma can wreak complete havoc with electronics.
Find out more with this Newsy video.