In November 2008, the Hong Kong Space Museum spent 34 million HKD on the first major overhaul of the planetarium since it opened in 1980. The major overhaul mainly involved the installation of a new digital planetarium projection system, a high-resolution projection system that is only available in a few space museums from other parts of the world. Not only can the system play 3D shows and movies on the hemispherical projection dome inside the space museum, but it is also capable of simulating scenes of stars, planets, and other celestial objects from anywhere in the universe, either in real time or at a past point in time. The 300 seats in the planetarium were also replaced with ones that spot a multilingual interactive feature. The wireless Bluetooth headsets and the newly designed display unit installed on the armrest of each seat allow the audience to send short messages to each other, participate in real-time games, answer audience satisfaction surveys, and perform a number of other activities.