Each mission will look for signs of water, a requirement for life on Earth.
Scientists hope to find older, more interesting rocks there, and perhaps tell-tale signs of water.
While Earth orbit is vital, keep in mind that visionaries like Elon Musk have in mind a human journey to Mars to look for signs of water and life.
The Environment Agency said no signs of contaminated water from the fire had been found in the nearby River Wye.
Last June, the scientific community was stunned by the announcement that there were signs of liquid water on modern Mars after all.
Forecasters say people should limit outdoor activity during the hottest portions of the day, wear lightweight clothing, drink plenty of water and be watchful for signs of heat exhaustion, which include heavy sweating, pale and clammy skin, weak pulse, fainting and vomiting.
"We'll possibly never know if these particular ones do have water oceans or signs of life, " she said.
As Spirit began ascending some hills about two miles from its landing site, it found signs that water was once on this part of Mars, too.
Lunar Prospector itself provided more evidence last year when it used an instrument called a neutron spectrometer to look for the tell-tale signs of hydrogen, one of the elements of water.
People held up handwritten signs asking for donations of oxygen cylinders, drills and water bottles.
These detectors constantly monitor for signs of trouble and routinely collect air, precipitation, drinking water, and milk samples for analysis of radioactivity.
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Droughts, floods and other water-related phenomena are among the clearest signs of climate change.
Space promoters tell us, once every few months, that there are signs that there might be or has been water on one of the planets that might make "life" possible.
Filled with sewage water and old food wrappers, it still bore the charred signs of explosives.
Few signs of life yet, however, for the dead-in-the-water housing market despite a jump in housing starts during June when good weather inspired construction companied to catch-up on previously stalled projects.
Evansdale, Iowa (CNN) -- Scent dogs used by searchers looking for signs of two missing young girls in Iowa ran around a lake and stopped at the water's edge, the mother of one of the girls said.
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Moreover, the indigenous community that Correa claims to represent is showing stronger signs of coordinated opposition to the already politically embattled president and are now latching onto a controversial water law to corner Correa on his environmental defense policies.
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Anglian Water has also written to GPs and hospitals asking them to be vigilant for signs and symptoms of cryptosporidiosis.
Some well water contains so much arsenic that an adult drinking four litres a day could start to show signs of poisoning.
New Mexico is embarking on its third straight year of drought, water supplies have dipped to record lows, farmers and ranchers are struggling, and there are now signs of feral swine in 22 of the state's 33 counties.
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