The Hubble Space Telescope is still trucking along more than 30 years after its launch, observing the universe and sending ...

More information: Yuanjie Xia et al, Thermal-controlled cholesteric liquid crystal wavelength filter lens for photosensitive epilepsy treatment, Cell Reports Physical Science (2024). DOI ...

Each colour within the visible light spectrum has its own narrow band of wavelength and frequency. When white light passes through a coloured filter, all colours are absorbed except for the colour ...