Discover the brightest stars, planets, and constellations of the season and hear their stories in the only planetarium in the National Park System. Ages 5 to adult. Free tickets to each planetarium show may be picked up at the Nature Center front desk up to one-half hour before the show. Out of respect for other planetarium guests, it is highly recommended that parents abide by the age recommendations, stated above. For visitor safety no admittance will be permitted once the planetarium doors close.