(CNN)When it launches in 2021, the James Webb Space Telescope will be the premier observatory of the next decade, according to NASA.
And in March, despite the threat of shutdowns due to the novel coronavirus pandemic, the infrared telescope passed another milestone test on the path to launch.
The telescope comes equipped with a mirror that can extend 21 feet and 4 inches -- a massive length that will allow the mirror to collect more light from the objects it observes once the telescope is in space. The more light the mirror can collect, the more details the telescope can observe.
It's the largest mirror NASA has ever built, the agency said, but its size created a unique problem. The mirror was so large that it couldn't fit inside a rocket. So they designed the telescope as a series of moving parts that can fold origami-style and fit inside a 16-foot space for launch.
During the recent mirror deployment test, the mission team was able to see the large mirror completely unfurled -- the same way it will be in space. The test took place in the cleanroom at Northrop Grumman Space Systems in California. The company has a contract with NASA for multiple missions.
In the test, the spacecraft successfully responded to commands to extend the mirror to its complete size.
It's one of a series of tests on a long list that will need to be checked off before the space telescope is packed up and shipped to French Guiana, where the 2021 launch will take place.
"Deploying both wings of the telescope while part of the fully assembled observatory is another significant milestone showing Webb will deploy properly in space. This is a great achievement and an inspiring image for the entire team," said Lee Feinberg, optical telescope element manager for Webb at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
The coronavirus pandemic will likely affect future testing for the space telescope.
Northrop Grumman's team has reduced their onsite personnel until sometime in April. After the Deployable Tower Assembly, another crucial comp