| Humans have developed specialized tools and strategies to explore specific areas 
of the Earth, including the arctic, caves, deserts,oceans, 
and urban environments; 
and even Earth's moon. 
With robotic machines, humans have also explored many parts of the heliosphere, 
and through measurements, beyond the Solar 
System and beyond the Milky 
Wayas part of an ongoing global Space 
exploration initiative. | 
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