# What type of electromagnetic energy is invisible to the human eye?

The electromagnetic spectrum is vast, ranging from the smallest Gamma waves at ${10}^{-} 6$ nanometres, to the largest radio waves at 100 km. Out of this whole spectrum, our eyes have only evolved to see a tiny, 300-nanometer range of it all. This range is between 400-700 nanometers and includes every single color we can see with our naked eye.