Hawaii's Supreme Court on Thursday are hearing arguments over a construction permit for the controversial Thirty Meter Telescope project on the summit of Mauna Kea.
Dozens of protesters gathered in front of the courtroom prior to the hearing in which lawyers from both sides are presenting their cases in an appeal of a decision to grant the construction permit.
No decision is expected immediately,
This was the second appeal over the telescope before the high court.
Justices are also considering another appeal that challenges the state's decision to let the University of Hawaii sublease the summit to telescope builders.
The telescope project has been the center of an ongoing debate for several years. Opponents say the project will desecrate land sacred to Native Hawaiians. Supporters say it will bring economic and educational opportunities to Hawaii.
The Associated Press contributed to this report.