Something big is about to happen on the sun, and it will have far reaching effects throughout the solar system. As we near the midpoint of Solar Cycle 24 and Solar Max, the magnetic field of the sun is about to reverse polarity. This is something solar physicists have studied since the 1970's so it's not a big deal, but it is interesting and it's bound to stir up some unsettled space weather in the very near future.
Here's a video from NASA that explains what's going on: