1. Mauna Kea Summit and Observatory is a volcanic peak located on the Big Island of Hawaii and stands at 13,796 feet above sea level. It is the highest point in Hawaii and a world-renowned astronomical site due to its clear skies and low light pollution. The summit is home to 13 major telescopes which are used by scientists from around the world to study the cosmos. The observatory includes several universities and research institutions, including the University of Hawaii.

Interesting facts about Mauna Kea Summit and Observatory are:

- The observatory is located above 40% of the Earth’s atmosphere, allowing scientists to study space with greater clarity.

- The summit is sacred to the native Hawaiians, and visitors are encouraged to show respect when visiting.

- The access road to the summit is unpaved and narrow, making it a challenging drive for many visitors.

- Due to the high altitude, visitors may experience altitude sickness and should take precautions, such as drinking plenty of water and taking it easy.

2. The observatory is open to visitors, but hours vary depending on the season and weather conditions. Visitors should call ahead to check on current hours and conditions. The phone number for the observatory is (808) 935-6268.

3. Tickets for visiting the observatory are not required, but visitors must have a four-wheel-drive vehicle to access the summit. Visitors must also have a permit to access the summit, which can be obtained from the Division of Forestry and Wildlife for a fee of $10. Transportation options for visitors include guided tours or rental cars. However, visitors should be aware that the access road is unpaved and narrow, making it a challenging drive for many visitors.