15 Mind-Blowing Scientific Facts About the Northern Lights

8. Red Auroras Are Rare

Red auroras are rare and occur only at high altitudes, typically between 150 and 200 miles (240 to 320 kilometers) above Earth’s surface. At these elevations, oxygen atoms are excited by charged particles, emitting red light. Their rarity makes them a coveted sight. More information can be found at NASA: Red and Green Aurora Australis.