In celebration of the close encounter with Mars at the end of August, Fiske Planetarium at the University of Colorado at Boulder will host a Mars Marathon beginning Aug. 26. The planetarium will have "Mars Marathon" events Aug. 26, 28, 29 and 30. The marathon will kick off Tuesday, Aug. 26, at 8 p.m. with "Martian Skies," a live presentation about what the skies look like above Colorado and from the surface of Mars. The audience also will get tips for viewing Mars this month. Admission for the show is $5 for adults, $4 for students and $3 for children and seniors.