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A Close Encounter for Earth and Mars
On Monday night, Earth and Mars will become cosmically cozy. The two will be at their closest in more than a decade, separated by just 47 million miles.
Normally, Mars is about 140 million miles from Earth on average, but that gap can widen to as much as 250 million miles when the two planets are on opposite sides of the sun.
http://www.nytimes.com/2016/05/31/science/mars-earth-closest-approach.html?
