As for staff on the ground, NASA headquarters advises the directors of its various centers around the country on who should keep working and who should stay home. Employees in both categories are furloughed, made to wait for their pay until after Congress approves funding legislation.

The number of employees at all of the agency’s facilities would shrink dramatically. According to a chart included in NASA’s shutdown plan, based on 2015 staffing levels, the workforce at the Goddard Spaceflight Center in Maryland, the agency’s largest facility by staff size, would be reduced from 3,244 to 221. Two hundred twenty-six employees would remain on call in case of emergencies. At Johnson Space Center, a staff of 3,095 would dwindle to 175, with 398 on call.

NASA centers and facilities close to the public, and the agency suspends use of its website and any streaming of its operations online. This means that, if the shutdown continues until next week, a space walk outside the ISS scheduled for Tuesday will not be televised.

The shutdown could potentially affect one of the agency’s commercial partners, SpaceX, Elon Musk’s company. SpaceX expects to conduct a major engine test of its Falcon Heavy rocket sometime this weekend at a launchpad at NASA’s Kennedy Space Center in Florida that the company has leased from the agency since 2014. The static-fire test doesn’t require any NASA involvement, but the shutdown may affect staffing and operations in and around the spaceflight center, creating unusual conditions for such a high-stakes procedure. SpaceX has not yet responded to a request for comment on the status of potential testing.

The United Launch Alliance, a joint venture of Lockheed Martin and Boeing—and a SpaceX competitor—got in just under the wire with a launch Friday night from Cape Canaveral Air Force Station in Florida. ULA’s Atlas V rocket carried a surveillance satellite from the U.S. Air Force.

The government shutdown comes on the anniversary of President Trump’s inauguration, and as NASA enters its second year without a permanent administrator. NASA chiefs are chosen by the White House and must be confirmed by the Senate. The Trump administration announced its pick, Oklahoma congressman Jim Bridenstine, last summer, but his nomination has stalled as Democrats and Republicans argue over his credentials and Congress works through a staggering to-do list. This week, after lawmakers failed to break a deadlock over federal protections for young, undocumented immigrants, Senate Democrats and some Republicans responded by blocking a House bill that would buy Congress more time to negotiate a long-term budget deal. (My colleague Russell Berman explains what’s actually happening in Congress.)

The White House also has yet to nominate a deputy administrator for NASA. Even the chief financial officer who signed NASA’s recent shutdown plan, Andrew Hunter, is serving on an interim basis.