La FCC approuve le premier lancement pour la constellation de réflecteurs spatiaux

A US start-up has received regulatory approval to launch a giant space mirror designed to redirect sunlight to Earth's night-time regions, marking a bold step toward using orbital technology to enhance renewable energy availability. Reflect Orbital, based in Hawthorne, California, announced last week that it has secured clearance from US authorities to begin testing its first satellite, Eärendil-1, which will carry a mirror capable of illuminating specific areas on Earth during nighttime hours. The company aims to eventually deploy 50,000 such mirrors in orbit by 2035, creating localized "full noon" conditions that could support continuous solar power generation and improve agricultural output. The mission involves launching Eärendil-1 into an orbit approximately 625 kilometers above Earth’s surface. Once in position, the satellite will unfurl a mirror measuring the size of a tennis court, yet 28 times thinner than a human hair. This lightweight, reflective surface will be precisely angled to direct sunlight toward designated test sites on the planet. The initial illumination area is estimated to cover around 24 square kilometers, with the ability to switch the light off remotely. The test phase is intended to validate the deployment and targeting systems before scaling up the project. Reflect Orbital claims that its technology could provide clean, reliable energy on demand, potentially aiding disaster response operations and boosting food production through extended daylight cycles for crops. Co-founder and CEO Ben Nowack emphasized that the first satellite serves as a critical proving ground, offering an opportunity to demonstrate the potential benefits while ensuring minimal disruption to populated areas. The company has developed numerous prototypes and is seeking external research collaboration to assess the broader impacts of its system. Despite these ambitions, concerns have been raised by some experts regarding the possible interference with astronomical observations. Astronomers warn that the widespread deployment of thousands of such mirrors could significantly hinder ground-based and optical astronomy due to increased light pollution. Roohi Dalal, deputy director of public policy at the American Astronomical Society, noted that the presence of 50,000 satellites might render traditional observational methods obsolete. However, Reflect Orbital maintains that its design includes safeguards to prevent interference with scientific instruments. The company has engaged in ongoing dialogue with scientists and asserts that feedback has influenced the development of its spacecraft and operational protocols. Technical challenges remain a key hurdle for the project. The deployment of the mirror requires precision, and even minor errors in hardware or software could lead to failure. Darren McKnight, a senior technical expert at LeoLabs, highlighted the risks associated with space debris, noting that millimeter- and centimeter-sized fragments are prevalent at the satellite’s operating altitude. These particles pose a threat to the delicate mirror, which could suffer degradation from repeated collisions. Additionally, the high concentration of atomic oxygen at this height presents another challenge, as it can erode spacecraft components over time. As Reflect Orbital prepares for its inaugural test mission, the success of Eärendil-1 will likely determine the feasibility of expanding the project. The company plans to conduct further trials and invite independent studies to evaluate both the environmental and societal implications of its approach. With the potential to reshape energy access and agricultural practices, the initiative represents a significant leap in the integration of space-based solutions with terrestrial sustainability goals. The outcome of this experiment will be crucial in determining whether orbital mirrors can become a viable tool for enhancing green energy on Earth.