Microgravity flame

A flame generated in space for the BASS-II combustion experiment on the  International Space Station.

ESA astronaut Alexander Gerst posted this  photo on Twitter, commenting: "This is a flame we generated in space. It  helps to increase fire safety on Earth."  

More about BASS: http://spaceflightsystems.grc.nasa.gov/SOPO/ICHO/IRP/MSG/BASS/  

More ISS science: http://www.esa.int/Our_Activities/Human_Spaceflight/Blue_dot/Space_Station_Science