The SMART-1 satellite is launched.

SMART-1 was a European Space Agency satellite that orbited the Moon. It was launched on 27 September 2003 at 23:14 UTC from the Guiana Space Centre in Kourou, French Guiana. "SMART-1" stands for Small Missions for Advanced Research in Technology-1, part of the Small Missions for Advanced Research in Technology programme. On 3 September 2006, SMART-1 was deliberately crashed into the Moon's surface, ending its mission.

September 27 is the 270th day of the year in the Gregorian calendar; 95 days remain until the end of the year.