China to launch man-made moons in space

China's man-made moon conception is expected to be realized in 2022, the Science and Technology Daily reported.

Man-made moon is a satellite carrying a huge space mirror, which can reflect the sun light to the Earth.

According to research plans, the verification of launch, orbit injection, unfolding, illumination, adjust and control of the man-made moon will be completed by 2020, said Wu Chunfeng, head of Tianfu New District System Science Research Institute in Chengdu, Southwest China's Sichuan province.

Three man-made moons will be launched in 2022. "By then, the three huge mirrors will divide the 360-degree orbital plane, realizing illuminating an area for 24 hours continuously," said Wu.

The reflected sun light can cover an area of 3,600 sq km to 6,400 sq km, and the illumination intensity is expected to be eight times of the moon light, according to Wu.

The moon orbits the Earth about 380,000 km from the Earth, while the man-made moon is expected to be put on an orbit within 500 km from the Earth.

Responding to worries whether the man-made moonlight will interrupt the normal day-night cycle of animals and plants, Wu said the light intensity and illumination time can be adjusted and the accuracy of illumination can be controlled within scores of meters. When a man-made moon is orbiting, people can only see a bright star in the sky.

Man-made moon is especially useful in civil area. "Using man-made moon to illuminate an area 50 sq km can save 1.2 billion yuan of electric charge," Wu said. "It can also illuminate blackout areas when natural disasters such as earthquake happen."

The US and Russia have explored man-made moon, hoping it can bring convenience to nighttime activities.

In the 1990s, Russia carried out an experiment called Banner, testing the idea of using a mirror to reflect the sun light to Earth. The mirror failed to unfold in space and the experiment was halted.

"China, Russia, the US, Japan and the EU are all striving to make technological breakthroughs on space energy application," said Wu.