Ancient Maya astronomers aligned their soaring temples with the stars and now modern archeologists have found the ruins of hidden cities in the Guatemalan jungle by peering down from space.

Archeologists and NASA scientists began teaming up five years ago to search for clues about the mysterious collapse of the Maya civilization that flourished in Central America and southern Mexico for 1,000 years.

The work is paying off, says archeologist William Saturno, who recently discovered five sprawling sites with hundreds of buildings using a spy satellite that can see through clouds and forest to reveal differences in the vegetation below.

Saturno said the satellite images made it infinitely easier to find ruins covered for centuries by dense jungle vines and trees. "It was like shooting fish in a barrel," he said.

Saturno first sought out satellite images to find a source of water near his excavation camp at San Bartolo, which lies 32 miles from the nearest town on inaccessible roads deep in Guatemala's northern Peten region.

NASA gave him a snapshot of solar radiation reflected off the wide variety of plants in the region. Saturno was surprised to see a pattern of discoloration in the satellite image that outlined some of the buildings he had already uncovered.

Using a GPS device, he pinpointed on a map the location of other discolorations nearby and discovered several areas with hidden Mayan architecture.