15000001

15000001 is the formal designation of a large‑scale scientific undertaking initiated by the International Space Organization (ISO) in early 2023. The project is focused on extending the precision of measurements of the cosmic microwave background radiation (CMB) by deploying a fleet of low‑Earth orbit interferometers equipped with cryogenically cooled bolometers. Its objectives are to refine constraints on cosmological parameters such as the Hubble constant, the sum of neutrino masses, and the properties of dark energy, as well as to search for subtle signatures of primordial gravitational waves.

The technical architecture of 15000001 consists of three primary subsystems: a data acquisition payload featuring a 1.2‑meter aperture telescope and a suite of microwave receivers covering 30–300 GHz; a real‑time processing unit employing field‑programmable gate arrays to filter and compress the raw data before downlink; and a ground segment that hosts an international network of calibration stations and a distributed data‑analysis consortium. During the mission life cycle, the spacecraft will complete an orbit every 90 minutes, collecting over 10 petabytes of telemetry by the end of its five‑year horizon.

Significant outcomes from the 15000001 initiative are expected to sharpen the cosmological model, potentially resolving tensions between local and global measurements of the universe’s expansion rate. The data products will be made publicly available through the ISO’s open‑access archive, fostering collaboration across the astrophysics community and enabling secondary investigations into topics ranging from Galactic foreground mapping to the physics of the early universe.