Two Chinese astronauts entered the orbiting space lab for a month-long stay early today after their spacecraft successfully docked to begin China's longest manned space mission, in yet another milestone for the Communist giant.<br/><br/>The Beijing Aerospace Control Centre (BACC) said that the Shenzhou-11 spacecraft that was launched on Monday morning docked with the Tiangong-2 space lab using an automated maneuver worked out during missions to an earlier experimental station. <br/><br/>BACC said that the astronauts entered Tiangong-2 after the spacecraft successfully docked with the space station and completed the automatic docking around 1 AM (IST). It also said that the rendezvous between the spacecraft and the lab took place over 393 kilometers above Earth.<br/>The two astronauts aboard Shenzhou-11 will spend a total of 33 days in space.<br/><br/>The two astronauts extended greetings to all the people of the nation in the space lab, and checked the status of the space complex formed by Shenzhou-11 and Tiangong-2.