#OTD 15 years ago, our Kepler telescope launched to detect planets outside our solar system. Before it retired in 2018, it helped us find thousands of new worlds … and much more! Here are a few of our favorite discoveries: Kepler’s steady gaze helped it spot the subtle dimming of a star’s light when a planet passed between us and the star. And it also helped Kepler see a supernova shockwave as it reached the surface of a star — an early moment in an unpredictable event: https://go.nasa.gov/438qR