World’s coldest, driest, calmest place discovered

Washington: Researchers have found the ideal spot for an observatory. The search for the best spot has led to the discovery of what is thought to be the coldest, driest, calmest place on Earth — a place where no human is thought to have ever set foot.

The untouched stretch of Antarctic terrain — Ridge A — is expected to yield images of the heavens three times sharper than any ever taken from the ground.

The team combined data from satellites, ground stations and climate models to assess factors that affect astronomy — cloud cover, temperature, sky-brightness, water vapour, wind speeds and atmospheric turbulence.

The researchers pinpointed a site, known simply as Ridge A, that is 4,053m high up on the Antarctic Plateau. It is not only particularly remote but extremely cold and dry.

The study revealed that Ridge A has an average winter temperature of -70 degree Celsius and that the water content of the entire atmosphere there is sometimes less than the thickness of a human hair.

It is also extremely calm, which means that there is very little of the atmospheric turbulence elsewhere that makes stars appear to twinkle: “It’s so calm that there’s almost no wind or weather there at all,” says Will Saunders, of the Anglo-Australian Observatory and visiting professor to UNSW, who led the study.

“The astronomical images taken at Ridge A should be at least three times sharper than at the best sites currently used by astronomers,” says Saunders.

“Because the sky there is so much darker and drier, it means that a modestly-sized telescope there would be as powerful as the largest telescopes anywhere else on Earth,” the expert added.

Located within the Australian Antarctic Territory, the site is 144 km from an international robotic observatory and the proposed new Chinese ‘Kunlun’ base at Dome A, a higher point on the Antarctic Plateau.

“Ridge A looks to be significantly better than elsewhere on the Antarctic plateau and far superior to the best existing observatories on high mountain tops in Hawaii and Chile,” says Saunders. ANI