Query: Yet, according to NASA, only one temperature sensing station is necessary for the two cities and the vast area between them to be adequately represented in their network.”

Relevant passages:
NASA Deep Space Network <=SEP=> The NASA Deep Space Network ( DSN ) is a worldwide network of US spacecraft communication facilities , located in the United States ( California ) , Spain ( Madrid ) , and Australia ( Canberra ) , that supports NASA 's interplanetary spacecraft missions . It also performs radio and radar astronomy observations for the exploration of the solar system and the universe , and supports selected Earth-orbiting missions . DSN is part of the NASA Jet Propulsion Laboratory ( JPL ) . Similar networks are run by Europe , Russia , China , India , and Japan .

City <=SEP=> A city is a large and permanent human settlement . Although there is no agreement on how a city is distinguished from a town in general English language meanings , many cities have special administrative , legal , or historical status based on local law .   Cities generally have complex systems for sanitation , utilities , land usage , housing , and transportation . The concentration of development greatly facilitates interaction between people and businesses , sometimes benefiting both parties in the process , but it also presents challenges to managing urban growth .   A big city or metropolis usually has associated suburbs and exurbs . Such cities are usually associated with metropolitan areas and urban areas , creating numerous business commuters traveling to urban centers for employment . Once a city expands far enough to reach another city , this region can be deemed a conurbation or megalopolis . Damascus is arguably the oldest city in the world . In terms of population , the largest city proper is Shanghai , while the fastest-growing is Dubai .

James Hansen <=SEP=> James Edward Hansen ( born 29 March 1941 ) is an American adjunct professor in the Department of Earth and Environmental Sciences at Columbia University . He is best known for his research in climatology , his 1988 Congressional testimony on climate change that helped raise broad awareness of global warming , and his advocacy of action to avoid dangerous climate change . In recent years he has become a climate activist to mitigate the effects of climate change , on a few occasions leading to his arrest .   In 2000 , Hansen advanced an alternative view of global warming over the last 100 years , arguing that during that time frame the negative forcing via aerosols and the positive forcing via largely balanced each other out , and that the 0.74 ± 0.18 ° C net rise in average global temperatures could mostly be explained by greenhouse gases other than carbon dioxide , such as methane and chlorofluorocarbons . However , even then he wrote `` the future balance of forcings is likely to shift toward dominance of CO2 over aerosols ''

Mars <=SEP=> Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System , after Mercury . Named after the Roman god of war , it is often referred to as the `` Red Planet '' because the iron oxide prevalent on its surface gives it a reddish appearance . Mars is a terrestrial planet with a thin atmosphere , having surface features reminiscent both of the impact craters of the Moon and the valleys , deserts , and polar ice caps of Earth .   The rotational period and seasonal cycles of Mars are likewise similar to those of Earth , as is the tilt that produces the seasons . Mars is the site of Olympus Mons , the largest volcano and second-highest known mountain in the Solar System , and of Valles Marineris , one of the largest canyons in the Solar System . The smooth Borealis basin in the northern hemisphere covers 40 % of the planet and may be a giant impact feature . Mars has two moons , Phobos and Deimos , which are small and irregularly shaped . These may be captured asteroids , similar to 5261 Eureka , a Mars trojan .   There are ongoing investigations assessing the past habitability potential of Mars , as well as the possibility of extant life . Future astrobiology missions are planned , including the Mars 2020 and ExoMars rovers . Liquid water can not exist on the surface of Mars due to low atmospheric pressure , which is about that of the Earth 's , except at the lowest elevations for short periods . The two polar ice caps appear to be made largely of water . The volume of water ice in the south polar ice cap , if melted , would be sufficient to cover the entire planetary surface to a depth of 11 m . In November 2016 , NASA reported finding a large amount of underground ice in the Utopia Planitia region of Mars . The volume of water detected has been estimated to be equivalent to the volume of water in Lake Superior .   Mars can easily be seen from Earth with the naked eye , as can its reddish coloring . Its apparent magnitude reaches − 2.91 , which is surpassed only by Jupiter , Venus , the Moon , and the Sun . Optical ground-based telescopes are typically limited to resolving features about 300 km across when Earth and Mars are closest because of Earth 's atmosphere .