Physics
The Bohr Model of the Atom
Quick fact
Bohr's model calculated the wavelengths of hydrogen's spectral lines with astonishing precision—matching experimental data to within 0.1%—a feat that classical physics could not achieve.
Why this is interesting
You've probably seen diagrams of atoms with electrons whizzing around a nucleus like tiny planets. But why don't they spiral inward, and why do atoms give off only specific colors of light? The Bohr model was the first to provide a surprising answer.