係架

galaxy: A system of about 100 billion stars. Our Sun is a member of the Milky Way Galaxy, which is sometimes just designated by capitalization: Galaxy. There are billions of galaxies in the observable universe. Exactly when and how galaxies formed in the Universe is a topic of current astronomical research.
http://antwrp.gsfc.nasa.gov/apod/lib/glossary.html
不過又係打返來銀河系