noun
gravitational lens
Physics term: a massive object that bends light from a background source, acting like a lens.
銀河団が重力レンズとして働き、遠くの銀河の像を歪めている。
The galaxy cluster acts as a gravitational lens, distorting the image of a distant galaxy.
Compound of 重力 (gravity) and レンズ (lens), a direct calque of English 'gravitational lens'.