This is one of my most popular photos among people who've hung my photos in their homes. The "starburst effect" is created by using a relatively small aperture and compensating with the other 2 exposure variables, shutter speed and ISO. For this shot I used a tripod and the night was nearly calm. My aperture was at f/25, ISO 3200, and shutter at 6 seconds.
You'll find that effects like this require some trial and error because of the variations in ambient conditions and in the cameras, of which so many now exist. It's the blades of the aperture that cause the effect and each lens has an aperture made specifically for it.