Last Sunday morning (May 22), Mars reached opposition with the sun, meaning the Red Planet, Earth and the sun were all arrayed in a straight line. This Monday evening (May 30) at 5:35 p.m. EDT (2135 GMT), Mars will be the closest it has been to Earth since Oct. 5, 2005: 0.50321377 astronomical units (AU), or 46,762,695 miles (75,279,709 kilometers). Opposition and closest Earth approach occur on different days because the orbit of Mars is elliptical.
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