Why the sun has two giant holes, and what that means for Earth

• Two giant holes, 18 to 30 times the size of Earth, have appeared on the surface of the sun.
• They could send 1.8 million mph solar winds toward Earth.
• They're called coronal holes, which are cooler areas that don't glow as bright as others.

Two giant holes appeared on the sun's surface. They're called coronal holes, and they'll send solar winds toward Earth, revealing stunning northern lights.