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The spacecraft has a small return vehicle that is meant to hold about half a pound of soil samples, plus other instruments and equipment.
Although a mission to bring back a piece of Mars -- probably about a pound of soil -- will not occur for at least a decade, designing, building and testing the quarantine center will take at least seven years, the panel said.
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Debris covered the 6,000 pounds of soil they had carted up to the terrace.
The partners, led by Ben Flanner, the president and head farmer, spread out 1.2 million pounds of soil and started planting.
I ruled out constructing "raised beds", which would have requires skilled carpentry, hundreds of pounds of soil and lies on top of lies to my landlord.
That meant I would have to haul up three gallons of water a day -- plus about 50 pounds of soil to get things started.
He purchased a hundred pounds of soil to put into the bathtub, three bushels of peat moss, eight rose bushes, and eight assorted perennials.
The most numerous soil organisms are the unicellular microfauna: 1 kilogram (2.2 pounds) of soil may contain 500 billion bacteria, 10 billion actinomycetes (filamentous bacteria, some of which produce antibiotics), and nearly 1 billion fungi.
Excavating nests that may occupy 23 cubic metres (800 cubic feet), a colony of A. sexdens leafcutters may turn over 40,000 kg (88,000 pounds) of soil in tropical moist forests, stimulating root growth of many plant species.
"I thought it would be hard to have a garden," said Deborah Gavito, who made this one last March, lugging 300 pounds of soil from her 1989 Chevy S-20 up those six flights, along with seven truckloads of wood, to make those boxes.
Jonathan Resnick, the president of Jack Resnick & Sons, which has owned the building for decades, said the main expense for the green expanse was in reinforcing the roof to bear up under 90,000 pounds of soil and a large wooden trellis — 80 feet long, 25 feet wide and 11 feet tall.
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