Eileen Collins, a retired NASA astronaut, said that she hoped the crew enjoyed their time in space. "It's a very wonderful, human experience," she said. "And as a former pilot, I feel a kinship with Liu Yang. I hope that someday we might meet."

Pamela Melory, also a retired NASA astronaut, acknowledged the significance of the docking.

"It is an impressive achievement, and a very difficult thing to do," she said. "From those of us who are passionate about space, we wish them congratulations on their accomplishment. However, I will say that it's not over until it's over. We'll be watching carefully, and hoping for their safety and success in returning to Earth."

Since starting its manned space mission in 1992, China has spent nearly 39 billion yuan ($6.13 billion) on the program, according to spokeswoman Wu.

Previously, the government announced ambitious plans for space travel, including building more powerful carrier rockets and space freighters, and the eventual construction of a space station.

The US and the former Soviet Union led the world in pioneering space travel. The US carried out a space docking in 1966. China is now the third country to successfully demonstrate its technical capability and knowledge for human space travel.

The slow and methodical pace at which China has developed its program is commendable, said John Logsdon, the former director of space policy at George Washington University, and current member of the NASA Advisory Council.

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