Chile takes astronomers closer to the heavens

  • Article by: SIMON ROMERO , New York Times
  • Updated: April 14, 2012 - 4:31 PM

Astronomers take their research 16,597 feet up -- to Chile's Atacama Desert -- placing them closer to the heavens in their quest for the origins of the universe.

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A giant transporter, which has 28 tires and engines equivalent to two Formula 1 racing vehicles, moved an antenna in the Atacama Desert in Chile.

Photo: Tomas Munita, New York Times

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LLANO DE CHAJNANTOR, CHILE -- Trucks stall on the road to this plateau 16,597 feet up in the Atacama Desert, where scientists are installing one of the world's largest ground-based astronomical projects. Heads ache. Noses bleed. Dizziness overcomes the researchers toiling in the shadow of the Licancabur volcano.

"Then there's what we call 'jelly legs,'" said Diego García-Appadoo, a Spanish astronomer studying galaxy formation. "You feel shattered, as if you ran a marathon."

Still, the same conditions that make the Atacama, Earth's driest desert, so inhospitable make it beguiling for astronomy. In northern Chile, it is far from big cities, with little light pollution. Its arid climate prevents radio signals from being absorbed by water droplets. The altitude, as high as the Himalaya base camps for climbers preparing to scale Mount Everest, places astronomers closer to the heavens.

Opened last October, the Atacama Large Millimeter/submillimeter Array (ALMA) will have spread 66 radio antennas near the spine of the Andes by the time it is completed next year. Drawing more than $1 billion in funding mainly from the United States, European countries and Japan, ALMA will help the oxygen-deprived scientists flocking to this region to study the origins of the universe.

The project also strengthens Chile's position in the vanguard of astronomy. Observatories are scattered throughout the Atacama, including the Cerro Paranal Observatory, where scientists discovered in 2010 the largest star observed to date.

But ALMA opens a new stage for astronomy in Chile, which is favored by international researchers for the stability of its economy and legal system. Like other radio telescopes, ALMA does not detect optical light but radio waves, allowing researchers to study parts of the universe that are dark, like the clouds of cold gas from which stars are formed.

Astronomers hope to see where the first galaxies were formed, and perhaps even detect solar systems with the conditions to support life, like water-bearing planets. But the scientists here express caution about their chances of finding life elsewhere in the universe, explaining that such definitive proof is likely to remain elusive. "We won't be able to see life, but perhaps signatures of life," said Dutch astronomer Thijs de Graauw, ALMA's director.

Still, scientists believe ALMA will make transformational leaps possible in the understanding of the universe, enabling a hunt for so-called cold gas tracers, the ashes of exploded stars from a time about a few hundred million years after the Big Bang that astronomers call "cosmic dawn."

ALMA's construction, said Jesús Mosterín, a Spanish philosopher who writes about the frontier between science and philosophy, is taking place at "the only time in history that windows into the universe are being thrown wide open."

Chile is not the only country luring big investments in astronomical projects. South Africa and Australia are competing to host an even bigger radio telescope, the Square Kilometer Array, which would be fully operational by 2024. China has begun building its own large radio telescope in Guizhou.

At the same time, the financial crisis in rich countries has raised concerns about funding for some ambitious projects. "It would be very sad for humankind if we were so spiritually decadent to forgo the pleasures of consciousness and of knowledge," Mosterín said. "These things make human beings a very interesting animal indeed."

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  • In a system similar to that on offshore oil platforms, scientists at the facility have shifts lasting up to 12 hours for eight days straight. Many toil through the night.

  • With funding of more than $1 billion, scientists will eventually spread 66 radio antennas near the spine of the Andes by next year.

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