Hale Telescope mirror.. It was completed in 1948 and is still in active use. The Hale Telescope represented the technological limit in building large optical telescopes for over 30 years. It was the largest telescope in the world until the Russian BTA-6 was built in 1976, and the second largest until the construction of the Keck Observatory Keck 1 in 1993. Hale supervised the building of the telescopes at the Mount Wilson Observatory with grants from the Carnegie Institution of Washington: the telescope in 1908 and the telescope in 1917. These telescopes were very successful, leading to the rapid advance in understanding
Major Atmospheric Cerenkov Experiment Telescope Major Atmospheric Cerenkov Experiment Telescope Major Atmospheric Cerenkov Experiment Telescope (MACE) is the world's largest telescope at the highest altitude being established at Hanle, Ladakh, India. It is being built by Electronics Corporation of India, Hyderabad, for the Bhabha Atomic Research Centre. It was assembled at the campus of Indian Astronomical Observatory at Hanle. Operational since 2016, it is remotely operated and runs on solar power. The telescope is the second-largest gamma ray telescope in the world and will help the scientific community enhance its understanding in the fields of astrophysics, fundamental physics, and particle acceleration mechanisms. The largest telescope