As NASA's SpaceX Dragon spacecraft docks with the ISS, its head, Charles Bolden, has warned that recent political events could impact the agency's mission.
NASA's much-desired third and final Shuttle flight this year looks likely to go ahead, following the release of its 2012 budget request.
The US Congress has approved NASA's budget for 2011, funding plans to develop commercial rockets and add one more shuttle flight to the two already scheduled.
NASA has announced its plans for the next few years. With the Constellation program for a manned moon landing axed, the focus will instead be on missions to the International Space Station and flight beyond Earth's orbit.