The James Webb Infrared Space Telescope, successor to the Hubble, is getting ready for for a 100-day freeze.
The mega telescope arrived in early May.
It will undergo a deep freeze or a cryogenic test to make sure it can function in the cold of deep space.
NASA scientists are preparing to launch the Webb into space in 2018.
The telescope has already gone through many tests to make sure it could withstand vibrations and conditions of launch and spaceflight.
Webb is a large infrared telescope with a 21-foot mirror.
NASA said thousands of astronomers worldwide will be able to use it to study deep space, the formation of solar systems with planets akin to Earth, and the evolution of our own solar system.
Webb is a joint project among NASA, the European Space Agency and the Canadian Space Agency.