What's really going on in Darth Vader's head? Hot air! Yes, you're looking at the world's most epic hot-air balloons as the world's largest free hot-air balllooning race takes off again: Welcome to the 31st annual Great Reno Balloon Race. From September 7-9, the US state of Nevada becomes a living canvas for the most colourful, creative and downright incredible hot-air balloons you'll see.

Images: Great Reno Balloon Race