For the second time in three years, a planet has been named after a young inventor from the city - a rare honour.
The minor planet 23165 was renamed Kakinchan last month after Tom Chan Ka-kin, 18, who is studying pharmacy at Chinese University, in recognition of a plastics substitute that he invented while a student at high school and entered in a US science fair in May.
Mr Chan won first place and best-of-category awards in the Intel international science and engineering fair with his project 'Miracle Bioplastics from Cellulose Waste', producing a transparent and waterproof material that has all the properties of plastic, but is biodegradable.
To honour his achievement, the International Astronomical Union, which is responsible for naming planets and celestial objects, named the planet after him.
Planet Kakinchan measures 3km to 6.5km in diameter and is in a group of minor planets between Jupiter and Mars.
Minor planets are bodies orbiting the Sun that are larger than meteoroids, but smaller than major planets.