This year's best photos of space
These are some of the best entries - professional and amateur - to the Royal Observatory Greenwich's Insight Astronomy Photography of the Year award.
Selina Cheng studied investigative reporting at Columbia Journalism School. She previously covered the Umbrella Revolution in Hong Kong for the Associated Press. She also wrote and produced for AFP Beijing and other media outlets in France, and speaks Cantonese, Mandarin, and French. She often edits photos or videos on her mobile while she's waiting for the train.