Mount Wilson Observatory: Building the 100 inch Telescope

🚨 OFFICIAL NOTICE: MOUNT RINJANI HIKING TRAILS CLOSED 🚨 The Mount Rinjani National Park Authority has announced a temporary closure of all hiking routes from 📅 January 1 – March 31, 2026 This closure is implemented to reduce disaster risks due to extreme weather and to allow the ecosystem to recover naturally 🌱 ❌ Closed routes include: Senaru, Torean, Sembalun, Timbanuh, Tetebatu, and Aik Berik 📝 Important information: • Last ticket booking: December 28, 2025 (11:59 PM WITA) • Last check-in