Artistic rendering of China's space station.

"The 60-ton space station is rather small compared to the International Space Station (419 tons), and Russia's Mir Space Station (137 tons) which served between 1996 and 2001," said Pang Zhihao, a researcher and deputy editor-in-chief of the monthly magazine, Space International.

"But it is the world's third multi-module space station, which usually demands much more complicated technology than a single-module space lab," he said.

The office also said that China will develop a cargo spaceship, with a maximum diameter of 3.35 meters and a launch weight less than 13 tons, to transport supplies and lab facilities to the space station.

Pang said it is the first time that the office confirmed plans to build a cargo spaceship, which is vital for long-term space missions.

The public is being asked to submit suggestions for names and symbols to adorn the space station.

"Considering past achievements and the bright future, we feel that the manned space program should have a more vivid symbol and that the future space station should carry a resounding and encouraging name," Wang Wenbao, director of the office, said at the news conference.

China previously named the space lab "Tiangong" meaning heavenly palace, and the spacecraft to transport astronauts was named "Shenzhou", divine vessel. Its moon probes were named after the country's mythical Moon Goddess "Chang'e". But the names were selected without public input.

"We now feel that the public should be involved in the names and symbols as this major project will enhance national prestige, and strengthen the national sense of cohesion and pride," Wang said.