An assessment of the plausibility of self-contained photon-propulsion systems weighs whether photon rockets could exist with plausible technologies, notes the 1952 Mount Palomar event and a Washington, DC UFO sighting as intriguing but unc… #aliens #apr2026 #ca #ovni #uap #ufo #ufosky #usa #youtube https://ufo-uap.news/R6uv.html