First operation of transition edge sensors in space with the Micro-X sounding rocket

The Micro-X Microcalorimeter X-ray Sounding Rocket launched for the first time in July 2018. This marked the first operation of high-resolution Transition-Edge Sensors in space, opening up sensitivity to new physics and advancing the technology readiness level of these detectors. The instrument performed nominally, observing X-rays from the onboard calibration source, although a rocket pointing error led to no time on-target. Micro-X is designed to observe extended sources like Supernova Remnants (SNR) and galactic dark matter. The first flight target was the Cas A SNR and the second flight, scheduled for March 2020, will target the Puppis A SNR. I will present the performance of the instrument in these flights, with particular emphasis on the successful engineering performance of the instrument and the demonstration of the detectors in space. I will also discuss the future of the program as an instrument to observe Supernova Remnants and indirectly search for galactic dark matter.