They contain thousands to millions of stars packed into a region of space just a few tens of light-years across.

BBC: NEWS | Science/Nature | Black hole found in ancient lair

It is colossal, 2.5 million times heavier than our Sun but crammed into a small region of space.

BBC: By BBC News Online Science Editor Dr David Whitehouse

Such detailed, small-scale measurements of a three-dimensional region of space would be impossible without satellites flying in formation.

ECONOMIST: Birds of a feather

Further observations from Voyager 1 should resolve the dispute, as well as provide information about a never-before-probed region of space.

BBC: NEWS | Science/Nature | Voyager 'at edge of Solar System'

"We'll be keeping an eye out for signs of a repeat performance next year when the Earth-moon system passes through the same region of space, " Cooke said.

CNN: Bright explosion on moon visible from Earth, NASA says

Cornwall produces about 300, 000 tonnes of waste a year and, according to the county council, the region will run out of landfill space by 2014.

BBC: Anger over Connon Bridge landfill extension plan

Expropriation brought into its hands about one-third of the urban space in the national-capital region (a rough square around Ottawa-Hull).

ECONOMIST: Canada

"The mere expectation that the amendment to the Forest Law and its consequent weakening would be approved set off a disturbing wave of renewed deforestation in the Amazon region, as has been unequivocally demonstrated by data recently released by the Brazilian Space Research Institute (INPE), " they write.

BBC: Brazil passes 'retrograde' forest code