The Cincinnati Observatory will open its doors and telescopes to the public on Saturday night while Mars is at its closest to Earth this year.Mars is the featured planet of the month at the Cincinnati Observatory in December, starting with a viewing extravaganza at the Cincinnati Observatory called "Marsapalooza". The Dec. 3 event runs from 7-10 p.m. at the Observatory on Observatory Place in Cincinnati.The event will feature talks about Mars, tours of the buildings, and viewing through the historic telescopes.The Moon and Jupiter will also be observed.Tickets on the day of the event are $15 for adults and $10 for children. No reservations are required.For more information on the event, click here.