It won’t actually built but a larger folding mirror design was explored in the LUVOIR (Large Ultraviolet Optical Infrared Surveyor) mission concept. Scroll down

It won’t actually built but a larger folding mirror design was explored in the LUVOIR (Large Ultraviolet Optical Infrared Surveyor) mission concept. Scroll down the wiki article for a comparison of the JWST and LUVOIR-A mirror size. https://en.wikipedia.org/wiki/Large_Ultraviolet_Optical_Infrared_Surveyor https://en.wikipedia.org/wiki/Large_Ultraviolet_Optical_Infr... Parts of that research could end up incorporated into the Habitable Worlds Observatory project. https://www.keckobservatory.org/hwo/ https://www.keckobservatory.org/hwo/