How Many Colors Does a Rainbow Really Have?

A rainbow is a continuous spectrum, but it is traditionally counted as seven colors: red, orange, yellow, green, blue, indigo, and violet (ROYGBIV).

The quiz answer is seven, the count Newton chose. In reality the spectrum is continuous, and some cultures and languages name only six, so the 'right' number depends who you ask.

A rainbow blends through countless shades with no hard boundaries. Newton picked seven; other traditions name six, which is why the count is debatable.