This work overviews the development, selection and test of novel compact compact solid-state photodetectors based on β-Ga 2 O 3 , and optimized for the UVC. These sensors show inherently low dark currents, permitting room temperature operation without the need for a cooling system (mass and power savings) and thus avoiding cold surfaces trapping of environmental contamination. The oxide detectors have a spectral response peak at around 215-220 nm with a linewidth of 35 nm, providing excellent rejection of wavelengths above 250 nm ("250 nm solar-blindness"). Alloying β-Ga2O3 with Al can boost the natural bandgap of 4.9 eV up to 6 eV, thus offering deeper UV operation. Other key assets of β-Ga 2 O 3 detectors for space applications are their intrinsic radiation hardness (longer lifetime), and their high potential gain that allows operation at lower voltages (several hundreds mA/W at-5 V). Presently under characterization (on more than 100 protoflight models) and presenting very promising performances, these detectors, after calibration and selection, will be integrated on a nanosatellite (INSPIRE-Sat 7, a "2U" cubesat) to be launched in early 2023 to monitor the 200-242 nm UVC solar flux. Indeed, amongst other potential uses, these UVC Herzberg continuum detectors are a unique possibility to monitor the UV input from the Sun in the Earth's stratosphere. The sensors are also projected for use in a number of future solar and climate satellite constellation ventures.