الأربعاء، 25 مايو 2011

Egyptian pyramids found by infra-red satellite images

Two new finds are at Saqqara, an older but less known pyramid site than Giza

By Frances Cronin
BBC News
Seventeen lost pyramids are among the buildings identified in a new satellite survey of Egypt.

More than 1,000 tombs and 3,000 ancient settlements were also revealed by looking at infra-red images which show up underground buildings.

Initial excavations have already confirmed some of the findings including of two suspected pyramids.

"To excavate a pyramid is the dream of every archaeologist," says Dr Sarah Parcak.

She has pioneered the work in space archaeology at the University of Alabama in Birmingham, and says she was amazed at how much she and her team have found.


An infra-red satellite image shows a buried pyramid, located in the centre of the highlight box. "We were very intensely doing this research for over a year. I could see the data as it was emerging, but for me the "A-Ha" moment was when I could step back and look at everything that we'd found and I couldn't believe we could locate so many sites all over Egypt."

The team analysed images from satellites orbiting 700km above the earth, equipped with cameras so powerful they can pin-point objects less than 1m in diameter on the earth's surface.

Infra-red imaging was used to highlight different materials under the surface.

Test excavations

Ancient Egyptians built their houses and structures out of mud brick, which is much denser than the soil that surrounds it, so the shapes of houses, temples and tombs can be seen.

"It just shows us how easy it is to underestimate both the size and scale of past human settlements," says Dr Parcak.

And she believes there are more antiquities to be discovered:

"These are just the sites [close to] the surface. There are many thousands of additional sites that the Nile has covered over with silt. This is just the beginning of this kind of work."

BBC cameras followed Dr Parcak on her "nervous" journey when she travelled to Egypt to see if excavations could back up what her technology could see under the surface.

In the BBC documentary Egypt's Lost Cities, they visit an area of Saqqara (Sakkara) where the authorities were not initially interested in her findings.

But after being told by Dr Parcak that she had seen two potential pyramids, they made test excavations and they now believe it is one of the most important archaeological sites in Egypt.

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