Micro-X is a NASA-funded X-ray space telescope payload, part of NASA's sounding rocket program. We successfully flew the first Transition-Edge Sensor (TES) microcalorimeter array in space during our first flight in July, 2018. Our next flight to observe Cas-A is scheduled for September 2019. Our versatile science program includes high-resolution spectroscopy of supernova remnants and searches for dark matter in the Milky Way.