bout 20 percent of employees at the U.S. National Aeronautics and Space Administration will leave its ranks shortly, a NASA spokesman has announced.

It is expected that approximately 3,870 employees will leave, but this number may change in the coming days and weeks, according to the same source. As a result, the agency’s workforce is expected to be reduced to around 14,000 employees.

No details were provided on the areas of expertise of the employees who will be leaving.