B01 Ultra-fundamental and theoretical (10^-100 to 10^-35)
Below the Planck length. No experiment reaches here and none is proposed; work in this band is mathematics and theory about what a physical theory would have to look like at all.
B02 Planck, fundamental and high-energy theory (10^-35 to 10^-18)
From the Planck length up to the smallest distances probed by collider experiments. Almost all of this band is inferred from theory rather than measured.
B03 Subatomic, particle and nuclear (10^-18 to 10^-12)
Quarks, nucleons and nuclei. Studied through accelerators, detectors, and the statistical analysis of very large datasets.
B04 Atomic and quantum (10^-12 to 10^-9)
Atoms, ions, electronic structure and quantum states. Directly measured with spectroscopy, traps and quantum devices.
B05 Nano (10^-9 to 10^-6)
Molecules, nanostructures, two-dimensional materials and quantum dots. Fabricated, imaged and characterised routinely.
B06 Micro (10^-6 to 10^-3)
Microelectronics, MEMS, microfluidics and cellular biology. Mature fabrication and metrology.
B07 Meso and human-scale devices (10^-3 to 10^0)
Components, instruments and devices a person can hold. Where most engineering prototypes are built and tested.
B08 Macro, infrastructure and planetary surface (10^0 to 10^6)
Machines, structures, vehicles, buildings and infrastructure networks, up to regional scale.
B09 Space, planetary and astronomical (10^6 to 10^13)
Planetary bodies, orbits and the Solar System. Reached by spacecraft and observed directly.
B10 Stellar and galactic modelling (10^13 to 10^26)
Stars, star systems, galaxies and large-scale structure. Observed remotely and modelled computationally. Nothing at this scale is engineered.
B11 Cosmological, theoretical and computational (10^26 to 10^100)
At and beyond the edge of the observable universe. A statement about this band is a statement about a cosmological model, not about anything that can be observed.