In the latest of our Discover series profiling hidden gems and places to visit around SE London and north Kent, we take a trip through time and space at the Peter Harrison Planetarium based at the Royal Observatory in Greenwich.

What makes the planetarium special?

Time travel is one of the main reasons people visit the planetarium, this as well as a huge range of presentations run by trained astronomers. This means you will come out of the experience knowing everything there is to know about the galaxy. The presentations are very interactive and so everyone and anyone can participate.

Are there any rumours of ghosts or famous stories about the planetarium?

Dr Edward Bloomer, an astronomer, told News Shopper that being scientists they don't believe in ghosts, but he has never heard any stories of any spirits. However, the observatory dates back to 1675 so there is literally hundreds of years of history there, including but not limited to the working lives of extremely famous scientific pioneers.

What’s the best time to come and visit? Is it suitable for everyone?

The planetarium is open seven days a week, with a varied programme that changes throughout the year. There is something for everyone, from guest lectures from active researchers offering an insight into cutting-edge science to 'Ted’s Space Adventure' for young children. The planetarium also does observing nights, short courses and even regular science-fiction film events (among a whole lot more), so there is a quite a bit going on…

How old is the planetarium?

The Peter Harrison Planetarium was built as part of a larger refurbishment of the Observatory in 2007, but they make regular upgrades to things like projection technology and the content they show audiences.

Are there any secrets?

The main bronze cone in the courtyard is pretty impressive looking, but hides some information in plain sight. The angles of the structure itself are such that they show you the latitude of the Observatory, point to the pole star, and indicate the Prime Meridian…

Tickets start at £8 for adults and £5.35 for children.