Advanced Technology Large-Aperture Space Telescope (ATLAST): A Technology Roadmap for the Next Decade

The Advanced Technology Large-Aperture Space Telescope (ATLAST) is a set of mission concepts for the next generation of UVOIR space observatory with a primary aperture diameter in the 8-m to 16-m range that will allow us to perform some of the most challenging observations to answer some of our most compelling questions, including “Is there life elsewhere in the Galaxy?” We have identified two different telescope architectures, but with similar optical designs, that span the range in viable technologies. The architectures are a telescope with a monolithic primary mirror and two variations of a telescope with a large segmented primary mirror. This approach provides us with several pathways to realizing the mission, which will be narrowed to one as our technology development progresses. The concepts invoke heritage from HST and JWST design, but also take significant departures from these designs to minimize complexity, mass, or both. Our report provides details on the mission concepts, shows the extraordinary scientific progress they would enable, and describes the most important technology development items. These are the mirrors, the detectors, and the high-contrast imaging technologies, whether internal to the observatory, or using an external occulter. Experience with JWST has shown that determined competitors, motivated by the development contracts and flight opportunities of the new observatory, are capable of achieving huge advances in technical and operational performance while keeping construction costs on the same scale as prior great observatories.

💡 Research Summary

The Advanced Technology Large‑Aperture Space Telescope (ATLAST) paper presents a comprehensive roadmap for a next‑generation ultraviolet‑optical‑infrared (UVOIR) observatory with primary apertures ranging from 8 m to 16 m. Two distinct architectural families are explored: a monolithic 8‑meter mirror that can be launched in a single launch vehicle, and segmented‑mirror designs spanning 9‑16 m that build on the heritage of the James Webb Space Telescope (JWST). Both families retain the classic three‑mirror anastigmat optical layout but diverge in structural implementation to reduce mass and complexity.

Scientific drivers are centered on the most compelling astrophysical questions of the coming decades. The primary goal is the direct detection and spectroscopic characterization of Earth‑like exoplanets in the habitable zones of nearby stars, requiring contrast ratios of 10⁻¹⁰ and inner working angles below 50 mas. Additional objectives include high‑resolution imaging of star‑forming regions and early‑epoch galaxies in the UV–visible, near‑infrared studies of dark matter and dark energy through large‑scale structure surveys, and detailed observations of Solar System small bodies.

Key technology development areas are identified as mirrors, detectors, and high‑contrast imaging systems. For mirrors, the monolithic option will employ ultra‑low‑expansion glass or silicon‑carbide substrates with active support structures to maintain nanometer‑level wavefront stability. The segmented option will use 1.5‑2.5 m segments equipped with high‑precision piezo‑electric actuators and edge‑sensor metrology, targeting sub‑10 nm segment phasing accuracy. Both paths require extensive thermal‑mechanical modeling and on‑ground validation to achieve TRL 9 by the mid‑2030s.

Detector development focuses on large‑format, low‑noise CMOS and EMCCD arrays that cover the full UV‑VIS‑NIR bandpass, offering quantum efficiencies above 90 % and dark currents below 10⁻⁴ e⁻ s⁻¹. Radiation‑hardening strategies and on‑chip correction electronics are incorporated to ensure long‑term performance in the harsh space environment.

High‑contrast imaging will be pursued through two complementary approaches. Internally, advanced coronagraphs such as vortex phase masks and PIAACMC will be paired with deformable mirrors (≥64 × 64 actuators) to achieve the required 10⁻¹⁰ contrast. Externally, a starshade (30‑70 m diameter) operating at distances of several hundred thousand kilometers will provide an alternative, broadband suppression of starlight. The paper outlines a parallel development program for both methods, recognizing that formation‑flying precision and optical edge‑control are critical risk areas for the starshade.

Programmatically, ATLAST leverages the engineering lessons of HST and JWST while encouraging competition among multiple contractors to drive cost‑effective innovation. The projected lifecycle spans 2025–2035, with technology maturation (TRL 6) targeted by 2028, system integration and ground testing through 2032, launch in 2033, and science operations commencing in 2034. Cost estimates remain comparable to previous flagship missions, emphasizing the use of heritage components and shared infrastructure.

In summary, ATLAST offers a flexible, technology‑rich pathway to a flagship observatory capable of answering whether life exists elsewhere in the Galaxy and of delivering transformative insights into cosmic evolution. By advancing mirror fabrication, detector performance, and high‑contrast imaging in tandem, the mission aims to deliver unprecedented scientific capability while maintaining fiscal and schedule discipline.