NASA has released the first images of a full-scale prototype for the six telescopes that will be included in the €1.5bn Laser Interferometer Space Antenna (LISA) mission.
LISA is a space-based gravitational-wave mission led by the European Space Agency and expected to launch in 2035.
The mission will consist of three satellites forming an equilateral triangle in space, with each side being 2.5 million kilometers long.
The prototype telescope, made of amber-colored glass-ceramic called Zerodur, was manufactured and assembled by L3Harris Technologies in New York.