Mars makes closest approach to Earth in 11 years on May 30

Mars AtmosphereA rare opportunity on the horizon!

Last Sunday morning, Mars reached opposition with the sun, meaning the Red Planet, Earth and the sun were all arrayed in a straight line. But the moment did not mark Mars’ closest approach to Earth.

This Monday evening (May 30) at 5:35 p.m. ET, Mars will be the closest it has been to Earth since Oct. 5, 2005: 0.50321377 astronomical units (AU), or 46,762,695 miles . (One AU is the average distance from Earth to the sun — about 93 million miles.)

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