For one to rise, others must fall. Hawaii's governor David Ige has given his blessing to the controversial Thirty Meter Telescope (TMT) that scientists want to build on the Mauna Kea mountain. But there's a catch -- in return, he wants "at least 25 percent" of the existing telescopes to be torn down. At the moment, there are 13 telescopes on the mountainside and only one is scheduled to be dismantled. Under Ige's new proposals, one facility would need to enter the decommissioning process this year, and the remainder in his 25 percent quota would need to be gone before the TMT is operational in the mid-2020s.