The main facilities of the museum are located in a building next to the planetarium, showcasing information about the Solar System, cosmology, and spaceflight.

[2] Ten years later, the Urban Services Department (USD) set up a working group to study overseas experience in establishing planetariums.

The study was aimed at laying the groundwork for setting up the future Hong Kong Space Museum.

The Hong Kong Government decided to build the museum at Tsim Sha Tsui and invited Mr. Joseph Liu to serve as Planetarium Advisor.

In 1974, The USD signed a contract with the Carl Zeiss Company to purchase a planetarium and other equipment with a price of HK$3,050,000.

The planetarium's egg-shaped dome covers more than 8,000 square metres, making it a famous landmark in Hong Kong.

It is also near the Star Ferry Pier and a bus terminus.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 new seats, which are equipped with an interactive system that supports multiple languages, can be reclined for a better viewing angle inside the projection dome.

[11] As a result of another renovation project, the Stanley Ho Space Theatre and the Lecture Hall were closed between 1 November 2015 and 1 March 2016.

The Leisure and Cultural Services Department said that it had planned to start the renovation in mid-2015 and finish it by the end of the year, during which the exhibition halls would close but shows would still continue as usual in the planetarium.

[13] In September 2015, the Leisure and Cultural Services Department announced that the two exhibition halls, which had been in use since 1991, would undergo renovation beginning on 5 October that year.

In 2018, an Oriental Daily News reporter was again sent to inspect the museum's exhibition halls, 4 months after they reopened following a renovation project.

Given that the state of the exhibits remained poor, it was said to be a huge waste of money and to have tarnished Hong Kong's image.

On 6 August, the then president of Hong Kong Baptist University Students' Union Keith Fong Chung-yin was arrested by undercover police for possession of offensive or lethal weapons after buying laser pointers in Sham Shui Po.

[23] On 7 August, the police said during a press conference that the laser pointers Fong had bought, which were 18 centimetres long, had a power output of 100 mW, high enough to classify them as weapons by law.

To prove that the laser pointers Fong had bought could cause bodily harm,[24] the police ignited some newspapers with them in front of the public.