Mars Mania is gripping people from Belfast to Bahrain as the Red Planet gets closer to the Earth than it's been in over 60,000 years. The window when the center of the earth is closest to Mars has passed - but currently Mars is closer to Chicago than it's ever been in the history of the city. You can check it at The Adler, but surface thermals and long lines there mean you might have better luck at The Ryerson Observatory.