Mission Comparison
Every orbital mirror humanity has ever launched, attempted, or seriously proposed — compared on the same axes. Year, operator, status, mirror area, mass, intended reflection target, and honest outcome. If you want to judge EARENDIL-1’s prospects, this is the historical base rate.
Tracked
Orbit
Sunlight
Attempts (1993–2026)
Every programme, on the same axes
Entries are ordered chronologically by intended launch year. Status uses a consistent five-state scale: Success, Partial / Brief, Failure, Pending, Proposed / Shelved.
| Mission | Year | Operator | Mirror Area | Mass | Orbit / Location | Intended Use | Status |
|---|---|---|---|---|---|---|---|
| Early Orbital Parasol J. Early · LLNL | 1989 | Lawrence Livermore US federal lab |
~2,000 km dia. | est. 108 kg | Sun–Earth L1 | Climate cooling block sunlight |
Proposed |
| Znamya-2 Progress M–15 · Soviet/RU | 1993 | NPO Energia / RSC Energia Russia |
20 m disk | not published | LEO · from Mir | Engineering demo brief night-side reflection |
Partial / Brief |
| Znamya-2.5 Progress M–40 · RU | 1999 | RSC Energia Russia |
25 m disk (planned) |
not published | LEO · from Mir | Sustained illumination Arctic settlements |
Failure |
| Chengdu “Artificial Moon” CASC / Tian Fu · CN | 2018 (announced) |
Chengdu Aerospace Sci. China |
not disclosed | not disclosed | LEO · planned | Street illumination Chengdu metro area |
Shelved |
| EARENDIL–1 Reflect Orbital · US | 2026 (target) |
Reflect Orbital Hawthorne, CA |
18 × 18 m | 16 kg | Sun-sync LEO ~625 km |
Commercial demo light to solar farms |
Pending |
| Reflect Orbital Constellation Full programme · US | post-2026 | Reflect Orbital commercial |
up to ~4,000 units planned |
16 kg / unit | Sun-sync LEO constellation |
Commercial service 260K+ requests on file |
Proposed |
What the table doesn’t tell you
Early’s Orbital Parasol — 1989
James Early proposed in 1989 that a 2,000-kilometre-wide orbital parasol stationed at the Sun–Earth L1 Lagrange point could offset anthropogenic climate warming by blocking a fraction of incoming solar radiation. It is the archetypal subtractive orbital mirror — designed to remove sunlight from Earth, not add it.
The proposal was never funded and the engineering scale was almost certainly beyond any conceivable near-term launch infrastructure. But it remains the intellectual ancestor of every serious orbital climate-engineering proposal since.
Znamya-2 — 1993
Deployed from Russia’s Progress M-15 resupply vessel to the Mir space station in February 1993, Znamya-2 unfurled a 20-metre reflective disk that briefly cast a bright spot roughly 5 km wide across Europe. Reports described a light roughly equivalent to a full moon moving across the night side of Earth at orbital velocity.
The mirror de-orbited shortly after and burned up. It was an engineering demonstration rather than an operational system, but it remains the only orbital mirror in history that actually did what space mirrors are supposed to do.
Znamya-2.5 — 1999
The follow-up to Znamya-2 was designed around a 25-metre reflector and intended to provide sustained illumination over Russian Arctic settlements during polar winter. The deployment from Progress M-40 snagged on a Mir antenna; the film tore before unfurling and never opened.
Russia abandoned the Znamya programme shortly afterward. No orbital mirror has been deployed in the 26 years since.
Chengdu “Artificial Moon” — 2018 announcement
In October 2018, the Chengdu Aerospace Science and Technology Microelectronics System Research Institute announced a plan to launch an “artificial moon” mirror satellite by 2020, claiming it could illuminate Chengdu at roughly eight times the brightness of the real moon. No technical specifications were published; no launch took place.
The announcement generated international press at the time but the project has produced no public updates since, no hardware photos, no flight plan, and no FCC-equivalent filings. It is most accurately described as shelved rather than cancelled — but for practical purposes, it never existed as hardware.
EARENDIL-1 — target 2026
Reflect Orbital’s Eärendil-1 is the first commercial space mirror ever to reach the pre-launch production phase. An 18-by-18-metre Mylar reflector, approximately 16 kilograms in mass, deployed origami-style from a small satellite bus into a sun-synchronous Low Earth Orbit at ~625 km. The reflector uses a parabolic-groove collimator (an innovation credited to founder Ben Nowack) to focus the reflected beam, increasing on-target brightness.
The technical design is a generational leap from Znamya — an order of magnitude lighter per square metre, using modern deployment mechanics designed by ex-JPL engineers, and targeted at a commercially useful operational lifetime rather than a one-off experiment. Whether it actually flies in 2026 depends on FCC licensing, which is currently contested by three astronomy organisations.
Reflect Orbital constellation — post-2026
Beyond Eärendil-1, Reflect Orbital’s long-term plan is a constellation of thousands of mirror satellites providing continuous reflection coverage across populated latitudes. Company statements have described a scale of up to ~4,000 satellites, though the regulatory path to that number is untested. Astronomer opposition has centred on this full-constellation prospect rather than the single demonstrator.
The 260,000 service requests already on file — from construction firms, event promoters, military buyers, and disaster relief organisations — suggest genuine commercial demand exists if the regulatory and technical problems can be solved. Whether they can is the defining open question of the programme.
What the comparison reveals
1 · Deployment is the single biggest failure mode
Of the two programmes that ever reached orbit, one had its deployment fail on the second attempt. Thin-film mirrors are structurally unforgiving — there’s no retry once the fabric tears. EARENDIL-1’s origami-folding design is explicitly a response to this history.
Affects: Znamya-2.5 · informs: EARENDIL-1 design2 · National programmes don’t sustain
Russia (Znamya), China (Chengdu), and US government concepts (Early, various DoD studies) have all produced proposals that attracted press, then quietly wound down when funding priorities shifted. Reflect Orbital is the first programme driven by private capital.
Affects: Znamya · Chengdu · Early · various DoD studies3 · Claimed brightness figures are rarely verified
Chengdu claimed “eight times lunar.” Znamya reports ranged from “full moon” to “a bright spot 5 km across.” EARENDIL-1 is the first programme whose pre-launch brightness estimates have been independently modelled by astronomers — and those models are exactly what’s driving the FCC opposition.
Relevant: How Bright? analysis4 · Astronomer opposition is the constant
Every serious orbital mirror proposal since the 1980s has attracted formal astronomy-community opposition on light-pollution grounds. Znamya avoided this only by being brief; Chengdu by never flying. Reflect Orbital is the first programme that has to win this argument, not bypass it.
See: Controversy · Astronomy ImpactCommon questions
How many orbital mirrors have ever actually been deployed?
Only two — both Russian. Znamya-2 deployed successfully from Progress M-15 in February 1993 and briefly reflected sunlight across Europe. Znamya-2.5 attempted deployment in February 1999 but the 25-metre film tore on an antenna before unfurling. No other orbital mirror has ever reached space.
What is the Chengdu artificial moon and did it ever launch?
Chengdu Aerospace Science and Technology Microelectronics System Research Institute announced in October 2018 a plan to launch an “artificial moon” mirror satellite to illuminate Chengdu by 2020. No launch has taken place and no public technical specifications were ever released. The project appears to have been quietly shelved.
How does EARENDIL-1 compare to Znamya-2?
EARENDIL-1 has a larger reflective area (18 by 18 metres vs Znamya-2’s 20-metre disk), lower mass (16 kg vs roughly 40 kg), uses modern Mylar film with a parabolic-groove collimator instead of Znamya’s spinning deployment, and targets a sun-synchronous Low Earth Orbit rather than Mir’s low-inclination orbit. EARENDIL-1 is also the first orbital mirror designed for sustained commercial operation rather than a one-off experiment.
Was James Early’s orbital parasol proposal ever built?
No. Early’s 1989 Lawrence Livermore proposal for a 2,000-kilometre-wide orbital parasol at the L1 Lagrange point was never funded or built. It is the archetypal orbital mirror climate-engineering concept but has never progressed beyond published research.
Why have so few orbital mirrors been built?
Three recurring reasons. First, deployment mechanics — thin-film mirrors are hard to unfurl without tearing, which killed Znamya-2.5. Second, economics — until the SpaceX rideshare era, launching large reflective structures was prohibitively expensive for any commercial case. Third, astronomer opposition — the astronomy community has consistently opposed orbital mirrors on light-pollution grounds, creating regulatory friction around every proposal.