This result, illustrated in Fig. , underscores the potential of the ASPIRE device for aerospace applications. In space, radiation is the sole method of heat transfer to the environment, and spacecraft experience significant thermal cycles when transitioning between solar illumination and shadowed regions. For example, the International Space Station (ISS) orbits the Earth 16 times a day, facing surface temperature ranging from -120 ℃ to 120 ℃ 57 . By exploring its rapid and tunable emittance properties, the ASPIRE device can attenuate extreme temperature variations, ensuring stabilized spacecraft temperature and crew safety. Moreover, this solution-processable electrochromic polymer approach offers a lightweight alternative to the conventional mechanical louvers in micro-(<20 kg) and nano-(<2 kg) satellites, thereby advancing next-generation thermal management solutions.