China plans huge solar power station in space

By PTI 

BEIJING: China plans to build a huge solar power station 36,000km above the ground in an attempt to battle smog, cut greenhouse gases and solve energy crisis, much on the lines of an idea first floated in 1941 by fiction writer Isaac Asimov, state media reported on Monday.

If realized, it will surpass the scale of the Apollo project and the International Space Station, and be the largest-ever space project.

The power station would be a super spacecraft on a geosynchronous orbit equipped with huge solar panels. The electricity generated would be converted to microwaves or lasers and transmitted to a collector on Earth, staterun Xinhua news agency reported.

In 1941, American science fiction writer Isaac Asimov had published a short story “Reason”, in which a space station transmits energy collected from the sun using microwave beams.

Wang Xiji, an academician of the Chinese Academy of Sciences and an International Academy of Astronautics member, says Asimov’s fiction has a scientific basis.

After devoting over 50 years to space technology research, Wang, 93, is an advocate for the station: “An economically viable space power station would be really huge, with the total area of the so lar panels reaching 5 to 6 sq km.”

That would be equivalent to 12 of Beijing’s Tian’anmen Square, the largest public square in the world.”Maybe people on Earth could see at night, like a star,” says Wang.

Wang says the electricity generated from the ground-based solar plants fluctuates with night and day and weather, but a space generator collects energy 99% of the time.Space-based solar panels can generate ten times as much electricity as ground-based panels per unit area, says Duan Baoyan, a member of the Chinese Academy of Engineering.”If we have space solar power technology”, hopefully we could solve the energy crisis on Earth,” Duan said. Wang says whoever obtains the technology first “could occupy the future energy market.” However, many hurdles lie ahead: A commercially viable space power station would weigh 10,000 tons. But few rockets can carry a payload of over 100 tons to low Earth orbit. “We need a cheap heavy-lift launchvehicle,” says Wang, who designed China’s first carrier rocket more than 40 years ago. “We also need to make very thin and light solar panels.”

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Indus re-enters India after two centuries

Indus re-enters India after two centuries, feeds Little Rann, Nal Sarovar

By D. P. Bhattacharya

The Indus or Sindhu, a major river flowing through Pakistan around which the great Indus Valley Civilisation flourished, may have shifted course after an earthquake in 1819, but recent satellite images show the river has re-entered India feeding a lake near Ahmedabad known as Nal Sarovar.

The discovery has been made by Rohan Thakkar, a postgraduate student of climate change working on the water bodies of Gujarat.

The development will hugely benefit the water-starved Kutch region as well as the Bhal region adjoining Ahmedabad district.

Speaking to Mail Today, Rohan said he spoke to his father about it after detecting that water from a river in Pakistan was flowing into the Rann of Kutch. Further examination of the satellite images showed the water was flowing from the Indus.

Rohan’s father Dr P. S. Thakkar, who is a satellite archaeologist with the Indian Space Research Organisation, said the river started flowing into India last year when the Indus river basin was heavily flooded. “Heavy rains had left the river basin along with the Mancher, Hemal and Kalri lakes inundated and people breached several canal heads,” Thakkar said.

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