In Hong Kong, astronomers who want to observe the stars and planets must travel to a remote village in the dead of night. Some have rented top-floor apartments in Hong Kong?s New Territories so they can gaze at the stars.
A huge amount of outdoor lighting makes the night can appear like day. ?The light, it lights up the sky so we cannot see a lot of the stars,? says Yeung Chi Hung, of the Hong Kong Astronomical Society.
To solve this problem, astronomers are trying to change the way buildings are lit. Often the light source is at the base of a building, with a beam that points upward. Experts say it should be the other way around.