Coldest, driest, calmest place on Earth found
September 1st, 2009 - 2:35 pm ICT by ANIWashington, Sept 1 (ANI): In a study to assess the many factors that affect astronomy, a joint US-Australian research team has found the ideal location for an observatory - known simply as “Ridge A”.
The untouched stretch of Antarctic terrain has been dubbed the coldest, calmest and driest place on Earth. No human is thought to have ever been there but it 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 minus 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 Dr 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 Dr 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.
They found that the best place in almost all respects was not the highest point on the Plateau - called Dome A - but 150km away along a flat ridge.
“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 Dr Saunders.
The finding is published today in the Publications of the Astronomical Society. (ANI)
- Astronomers locate site for perfect observatory - Sep 01, 2009
- Vast icy plateau in Antarctica is calmest place on Earth - Oct 17, 2009
- Hyderabad's Birla observatory to open for public - Nov 15, 2011
- View Earth's clearest skies from Antarctic plateau, say scientists - Jun 08, 2009
- Astronomical observatory to come up in Tibet - Apr 13, 2012
- Explore stars in the US from India using internet telescope - Apr 09, 2012
- China installs largest optical telescope in Antarctica - Apr 19, 2012
- India joins next generation 30m telescope project on Mauna Kea - Jun 26, 2010
- Heritage Walk organized to celebrate National Science Day - Feb 28, 2012
- Now zoom into universe through Windows - Sep 03, 2010
- Simultaneous signals from 2 pulsars heralds new era in radio astronomy - Nov 23, 2010
- Classical music bears imprint of changing weather - Oct 03, 2011
- Scientist to make stellar observations aboard Boeing 747 - Dec 02, 2010
- LOFAR raises hopes of unravelling mysteries of universe - Jun 15, 2010
- NASA launches SOFIA - May 29, 2010
Tags: antarctic plateau, astronomers, astronomical images, atmospheric turbulence, australian observatory, climate models, cloud cover, degree celsius, dr saunders, driest place on earth, human hair, least three times, place on earth, sky brightness, telescopes, twinkle, visiting professor, water content, wind speeds, winter temperature