EDUCATIONAL Science
Supernumerary Rainbows Over New Jersey: How Faint Extra Bands Prove Light Is a Wave
Retrospective coverage of NASA's Astronomy Picture of the Day for October 4, 2026: a 2018 New Jersey photograph showing at least five supernumerary rainbow bands, per the APOD text and photographer account. The faint extra arcs are interference fringes, not camera artifacts, and they encode droplet size while demonstrating that light travels as a wave.