Another one will investigate the "cool flames" phenomenon, wherein some fuels burn intensely at first then suddenly appear to go out. In truth, they're still burning -- we just can't see the flames with the naked eye. By looking closely into cool flames, NASA will be able to create more efficient engines and eco-friendly fuels.

Cygnus is also carrying a new lighting system designed to help astronauts maintain their biological clock and to help them be alert at all times. There's a Fast Neutron Spectrometer aboard, as well, which will collect data on high-energy neutrons, part of the radiation astronauts' bodies experience. The spacecraft will reach the ISS on October 23rd and will be coming back in late November, so we'll have to wait till then to hear about Saffire 2's results.