It had to be engaged somehow if the ascent engine was to fire and lift us off the surface.
Nasa's Mars rover Curiosity has used its brush tool for the first time to sweep dust off the surface of a rock.
Its texture and chemistry set it apart from all previous objects picked up off the surface of Earth but known to originate on the Red Planet.
The song seems to uncoil when Finn and Barnes hit the bridge, with ideas evaporating off the surface faster than they can be spotted, let alone captured.
The trainees discovered the advantages of levelling the steep slopes into horizontall terraces, in order for the rain to penetrate the hillside rather than running off the surface.
In early August, the federal government estimated that about three-quarters of the oil spilled had either evaporated or been dispersed, or had been skimmed or burned off the surface.
While some shrimpers are eager to get back out, many are still working for BP, which has hired boats to skim oil off the surface and lay protective booms along the shorelines.
The caesium finds its way into tiny pores on the surface, and the only way to remove it effectively is to grind off the surface, a difficult procedure which can create contaminated dust.
Chevron was slammed in the press for the accident, though the oil sheen was cleaned off the surface of the Atlantic in less than two weeks and no oil washed up on the famed Rio de Janeiro beaches.
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Andre Geim and Konstantin Novoselov, of the University of Manchester, made graphene in 2004 using what may be the simplest experiment ever to win a Nobel prize: they peeled it off the surface of a piece of graphite using sticky tape.
"Given the subtle slopes of the greens, don't be surprised if you see putts rolling off the putting surface should the wind get up, " he said.
But it's not just the bounce and speed of the ball off the clay surface that sets it apart from other courts, and makes the French Open an elusive tournament for some players.
The SeaWinds satellite, managed by NASA for the Jet Propulsion Laboratory, carries a scatterometer instrument that has measured those sea winds via microwaves bounced off the ocean's surface since the satellite's launch in June.
Old Trafford is a football pitch, so the grass is shorter and with the game kicking off at 1800 BST, the surface will be slippier, so I'm not expecting many long-range tries.
The pair's radars work by constantly bouncing microwave pulses off the ground and sea surface.
The Esa satellite's radiometer works by measuring the natural emission of microwaves coming up off the planet's surface.
During a short cycle the solar wind (a breeze of electrically charged gas blowing off the sun's surface) is stronger than normal.
MOLA, which works by bouncing beams of light off the planet's surface, has found mountains twice as high as Everest, a crater ten kilometres deep, and huge valleys carved by more water than scientists believed had ever existed on Mars.
To calculate this, the team took data from patches of forest studied on the ground, in which every tree's diameter has been recorded, and combined them with images from MODIS and with data from an instrument called GLAS, which bounced laser beams off the Earth's surface between 2003 and 2009.
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Within a matter of minutes, the MRSA on the copper surface began to die off, whereas the population thrived on the stainless steel.
As the tip continued its movement across the surface, the antibody was snapped off the antigen and dragged along until it hit another receptive site.
The antibodies bind to the CTLA-4, found on a cell's surface, and shut off the brake.
It will be located 4km below the surface, off the coast of Greece.
The track is now "sealed, " or packed down so that excess water rolls off rather being absorbed in the surface.
What the problems were then finally became clear on Monday, when part of the road surface on both lifting leaves fell off overnight when the bridge was raised.
When heated to a high temperature, the bath gives off a mist of atoms that fall on to the surface of the object.
The force of the current where the river ran faster almost knocked her off balance, though it looked lazy on the surface.
But no matter what happens, the game set everyone off on the same footing, on the same level surface.
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On Saturday, an electronic tag programmed to pop off after 30 days floated to the surface and began radioing data to a research lab.
Obviously at 400 feet it's really quite dark but at the surface it starts off being very very light, even without a mask I can tell that.
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