The Planet Trail SIRIUS follows for the greater part marked hiking trails. From the Observatory, the trail passes below the Blueme Observation Tower up to Tschingelallmi. Here it forks out to Heiligenschwendi or Schwanden. Hiking time is approx. 2 hours. The Planet Trail gives the hiker a feel for the distances of celestial bodies in outer space. The planets are explained on informational markers. The information is also available for downloading from the Internet onto the Player (Audio Guide).