Reflect Orbital

Reflect Orbital is an American space-technology company founded in 2021 by Ben Nowack and Tristan Semmelhack. Based in Hawthorne, California, the company is developing satellites equipped with large, steerable, highly reflective membranes designed to redirect sunlight from low Earth orbit toward selected locations on the ground. Its proposed service is intended to provide limited illumination after sunset and to extend the useful operating period of solar farms into evening hours. The company's concept builds on a much older idea: orbital mirrors have been discussed since at least the early twentieth century, when physicist Hermann Oberth considered using large reflective surfaces in space to illuminate Earth or influence climate. The Soviet-Russian Znamya 2 mission remains the principal historical demonstration of the concept. Launched from a Progress cargo spacecraft in 1993, Znamya 2 deployed a roughly 20-metre Mylar reflector and briefly projected a moving, moonlight-like spot over parts of Europe. A follow-up Znamya 2.5 mission failed during deployment in 1999. Reflect Orbital's early work focused on demonstrating whether a controllable reflector could direct useful light toward a terrestrial target. In March 2024, the company publicized a test in which a roughly 2.5-metre-square mirror was controlled from a hot-air balloon and directed sunlight onto ground-based solar panels during twilight. The company reported an irradiance of approximately 516 watts per square metre at instruments positioned 242 metres below the mirror. It later reported receiving more than 260,000 inquiries by the end of 2025 concerning possible uses including construction-site lighting, public events, search and rescue, military activity, disaster relief, and solar-energy production. The company's principal demonstrator is Eärendil-1, a planned spacecraft designed to test a large deployable heliostat in sun-synchronous orbit. The satellite is described as having a mass of approximately 142 kilograms and an 18-by-18-metre reflective membrane. Its reflector is intended to deploy from a compact launch configuration using carbon-fibre booms and to direct a moving spot approximately five kilometres in diameter toward selected areas on Earth. Because a low-Earth-orbit satellite passes rapidly over a target, one spacecraft would illuminate a location for only about four minutes per pass; longer or more continuous service would require multiple satellites. Reflect Orbital has presented a long-term ambition to operate a large constellation, potentially reaching as many as 50,000 reflector satellites by 2035. The company has also described an intermediate objective of supplying solar farms with roughly 200 watts per square metre during evening electricity-demand peaks by around 2030. These goals remain dependent on successful demonstrations, regulatory approvals, financing, launch availability, technical performance, and public acceptance. The business has attracted venture investment from firms and individual investors including Sequoia Capital, Lux Capital, and Starship Ventures. It also received a Phase II Small Business Innovation Research contract from the Air Force Research Laboratory and AFWERX to develop reflector technology. Reflect Orbital remains privately held and has no publicly traded ticker. The proposed system has generated substantial controversy. Astronomers and dark-sky advocates warn that bright orbital reflectors could interfere with optical observations, increase artificial sky brightness, and affect wildlife and human circadian rhythms. A 2026 study associated with the European Southern Observatory estimated that a full fleet could materially brighten the night sky and that a reflector viewed within its beam could be much brighter than the full Moon. Reflect Orbital has responded that its system is designed to confine light to selected targets, avoid observatories and sensitive habitats, and cease reflecting when required. The company has also said that its demonstration program will be used to develop safeguards and coordinate with NASA, the National Science Foundation, and the astronomical community.

Reflect Orbital was founded in October 2021 by Ben Nowack and Tristan Semmelhack. Nowack had previously worked as an aerospace engineer at SpaceX, while Semmelhack had worked as a mechanical engineer at Zipline and later left Stanford University to join the venture. The founders pursued an orbital-mirror concept intended to redirect sunlight to Earth after sunset. The underlying idea predates the company by roughly a century. Hermann Oberth discussed the use of large mirrors in orbit during the 1920s. The most notable physical precursor was Znamya 2, a Soviet-Russian experiment launched in 1993 from a Progress cargo vehicle near the Mir space station. Its 20-metre reflective membrane produced a short-lived moving patch of moonlight-like illumination over Europe. The later Znamya 2.5 mission failed when its reflector became caught during deployment in 1999. Reflect Orbital publicized an early terrestrial demonstration in March 2024. A mirror approximately 2.5 metres across was robotically controlled from a hot-air balloon and directed sunlight toward solar panels during twilight. The company reported approximately 516 watts per square metre at measurement equipment below the balloon. The test was intended to show that a steerable mirror could redirect sunlight with useful precision rather than merely create a broad, uncontrolled glow. In September 2024, Reflect Orbital announced a seed financing round led by Sequoia Capital and Shaun Maguire. In May 2025, it announced an additional investment round involving Lux Capital, Sequoia Capital, and Starship Ventures. In June 2025, the Air Force Research Laboratory and AFWERX selected the company for a Phase II SBIR contract focused on reflector development. The company has described its financing as supporting spacecraft development and demonstration activities. Reflect Orbital's first planned space mission is Eärendil-1. Announced in 2025, the mission is intended to demonstrate a deployable, steerable thin-film reflector in sun-synchronous orbit. The spacecraft is described as carrying an 18-metre-square reflective membrane with a total reflective area of approximately 324 square metres. The membrane is designed to fold into a compact launch configuration and deploy using carbon-fibre booms. The satellite is expected to use control-moment gyroscopes for pointing and may use solar-radiation pressure for orbit and attitude-related operations. Its proposed role is to illuminate about ten locations during the demonstration period. The company has outlined a much larger commercial system. It has said that a constellation could support solar farms during evening demand peaks, with a stated objective of approximately 200 watts per square metre by around 2030. Its longer-term aspiration is a fleet of up to 50,000 satellites by 2035. These plans are proposals rather than an operating constellation, and their realization depends on regulatory, engineering, launch, financing, and environmental constraints. Regulatory scrutiny intensified as the company sought permission to fly. The FCC authorized Eärendil-1 in July 2026, granting a two-year communications authorization and limiting the approval to the single demonstration satellite. The commission treated the test as potentially useful to the public interest but noted that optical-astronomy impacts were outside the principal scope of its jurisdiction. The application attracted more than 1,800 public comments, many of them negative. The proposed technology has been criticized by astronomers because reflected sunlight could create bright moving objects and contaminate telescope exposures. A peer-reviewed 2026 study by Olivier Hainaut associated with the European Southern Observatory assessed the planned fleet as exceptionally bright compared with other proposed satellite systems. It estimated that a reflector viewed directly within its beam could appear several times brighter than the full Moon, while a full constellation could substantially increase overall night-sky brightness. Critics also cite possible effects on wildlife and human sleep cycles. Reflect Orbital has said that its mirrors would be aimed only at defined target areas, steered away from observatories and protected habitats, and capable of being turned off by ceasing to direct light toward Earth. The company has stated that the demonstration mission will help test these safeguards and that it intends to coordinate with NASA, the National Science Foundation, and astronomers. As of the supplied reference material, the company remains a private, development-stage space-technology business rather than an established satellite-service operator.

• 2026

  FCC authorization for Eärendil-1

  [1]Reflect Orbitalen.wikipedia.org

  The FCC authorized the first demonstration satellite while restricting the approval to that individual spacecraft.

• 2025

  Eärendil-1 mission announced

  [1]Reflect Orbitalen.wikipedia.org

  The company announced its first satellite demonstrator, Eärendil-1, to test a large deployable orbital reflector.

• 2025

  Additional financing and SBIR support

  [1]Reflect Orbitalen.wikipedia.org

  Reflect Orbital announced additional venture financing and received a Phase II SBIR award from AFRL and AFWERX.

• 2024

  Balloon-based reflector demonstration

  [1]Reflect Orbitalen.wikipedia.org

  The company demonstrated robotic control of a roughly 2.5-metre mirror from a hot-air balloon to redirect sunlight onto ground-based solar panels during twilight.

• 2024

  Seed round announced

  [1]Reflect Orbitalen.wikipedia.org

  Reflect Orbital announced seed financing led by Sequoia Capital and Shaun Maguire.

• 2021

  Company founded

  [1]Reflect Orbitalen.wikipedia.org

  Ben Nowack and Tristan Semmelhack founded Reflect Orbital in October 2021.

Reflect Orbital positions itself as a space-infrastructure company seeking to make sunlight available after sunset for energy, emergency response, industrial, public-event, and security applications. Its differentiation is the proposed use of steerable, large-area orbital mirrors rather than conventional terrestrial lighting or energy-storage systems.

• Demonstration satellite · 2026

  Eärendil-1

  Eärendil-1 is Reflect Orbital's planned first orbital demonstrator. It is described as a roughly 142-kilogram spacecraft carrying an 18-by-18-metre steerable thin-film reflector. The membrane is designed to deploy from a compact launch configuration using carbon-fibre booms and to redirect sunlight toward selected locations from an altitude of approximately 600 to 650 kilometres. The spacecraft is intended to validate deployment, pointing, beam control, and operational safeguards.

• Satellite service

  Orbital reflector constellation

  The proposed constellation would use multiple reflector satellites to provide illumination after dark or extend sunlight availability for solar farms. Because each spacecraft would remain over a target for only a limited period during an orbital pass, coordinated fleets would be needed for longer service windows or higher intensity. Reflect Orbital has discussed a possible fleet of up to 50,000 satellites, but the system remains a future proposal.

• 2024Balloon reflector demonstration

  United States

  Reflect Orbital used a hot-air balloon and a remotely controlled mirror to demonstrate sunlight redirection toward ground-based solar panels during twilight.

  Outcome. The company reported measurable redirected irradiance and used the test to support development of its orbital system.

  Source

• 2026

  Pursue a large orbital reflector constellationStrategy

  Background

  The company has described potential applications in solar-energy production, emergency response, industrial lighting, events, and defense.

  Action taken

  Reflect Orbital stated a long-term ambition to deploy as many as 50,000 reflector satellites by 2035, subject to further development and approvals.

  Aftermath

  The proposal prompted significant concern from astronomers and dark-sky advocates about optical interference and artificial sky brightness.

  Source

• 2025

  Proceed with the Eärendil-1 orbital demonstrationProduct launch

  Background

  Reflect Orbital selected a large deployable reflector satellite as its first space demonstration rather than immediately attempting a commercial constellation.

  Action taken

  The company planned a rideshare launch for Eärendil-1 and designed the mission to test deployment, steering, illumination, and safeguards.

  Aftermath

  The mission became the subject of FCC licensing and public debate over astronomy and night-sky impacts.

  Source

1. 1Reflect Orbitalen.wikipedia.org