The China Mail - Astronomers in Chile to scour universe with car-sized mega camera

The size of a small car and weighing 2.8 metric tons, the sophisticated piece of equipment will reveal views of the cosmos as never before, officials from the US-funded project told AFP.

Beginning in early 2025, when the $800 million camera will snap its first photos, the machine will sweep the sky every three days, allowing scientists to reach new heights in their galactic analyses.

Researchers will be able to go from "studying one star and knowing everything in-depth about that one star, to studying thousands of stars at a time," said Bruno Dias, president of the Chilean Society of Astronomy (Sochias).

According to Stuartt Corder, deputy director of NOIRLab, the US research center running the observatory located 2,500 meters (8,200 feet) up the Cerro Pachon mountain, 560 kilometers (350 miles) north of Santiago, the new facility will usher in "a paradigm shift in astronomy."

The project solidifies Chile's dominant position in astronomical observation, as the South American country is home to a third of the globe's most powerful telescopes, according to Sochias, and boasts among the clearest skies on the planet.

The Rubin Observatory camera's first task will be to complete a 10-year review of the sky, called the Legacy Survey of Space and Time (LSST), which researchers hope will reveal information about 20 million galaxies, 17 billion stars and six million space objects.

The survey will give scientists an up-to-date inventory of images of the solar system, allow them to map our own galaxy, the Milky Way, and delve deeper into the study of energy and dark matter.

- 300 TVs for one picture -

The new camera will be able to capture 3,200-megapixel photos -- resulting in images so large they would require more than 300 average-size high-definition televisions, lined up together, to view just one.

The machine, built in California, will have triple the capacity of the world's current most powerful camera, the 870-megapixel Hyper Suprime-Cam in Japan, and will have six times the capacity of NOIRLab's most powerful camera.

The lab's existing top camera, on Chile's Cerro Tololo mountain, is only 520 megapixels, according to Jacques Sebag, head of construction of the Rubin telescope.

Chile's telescopes have come a long way since the 40-centimeter Cerro Tololo telescope, at the country's first international observatory, installed in the 1960s.

"That telescope arrived here on the back of a mule, because there was no road," said Stephen Heathcote, director of the Cerro Tololo Inter-American Observatory, only 20 kilometers from Cerro Pachon.

- Astronomy capital of the world -

The Vera C. Rubin Observatory, named in honor of the US astronomer who discovered dark matter, will join several other space observation research centers in northern Chile.

The natural conditions of the region's desert landscape -- tucked between the Pacific Ocean and the Andes mountain range -- creates the clearest skies on the planet, thanks to a dry climate with little cloud cover.

The area plays host to telescopes from more than 30 countries, including some of the most powerful astronomical instruments in the world, such as the radio telescope at the ALMA Observatory and the under-construction Extremely Large Telescope, which by 2027 is set to be able to view never-before-seen reaches of the universe.

Many of humanity's most important astronomical discoveries have been made at the Cerro Tololo observatory, such as the 2011 Nobel Prize-winning revelation that expansion of the universe is picking up speed, a phenomenon known as cosmic acceleration.

Though other influential observatories have been opened around the globe, including in the United States, Australia, China and Spain, "Chile is unbeatable" in the world of astronomy, said Dias, the Sochias president.

C.Fong--ThChM