ScienceSeptember 2, 2026
lightsail
LYT-sayl
Definition
A spacecraft propulsion device consisting of a large, highly reflective sheet designed to be pushed by the pressure of photons from a laser or star.
Etymology
This is a compound word formed by combining the noun 'light' (referring to electromagnetic radiation) and 'sail' (a device used to harness wind), reflecting the conceptual shift from wind-powered maritime navigation to photon-powered space propulsion.
In the news
The article discusses the theoretical limitations of using a lightsail for interstellar travel, specifically focusing on how relativistic speeds create unintended drag forces.
Interstellar solar sails hit a strange problem at 75% of light speed
Read the full article ↗Science Daily