NASA and Orbital ATK had to put off Antares' comeback until the next day due to a glitch, but everything went well the second try. The rocket finally blasted off to space carrying a Cygnus spacecraft with supplies for the ISS, as well as a bunch of cool scientific experiments. One of its science payloads is the Saffire 2, the follow-up to the largest fire experiment conducted outside our planet. Saffire 2 will burn nine samples made of various materials aboard the Cygnus as it makes its way back to Earth. That will allow scientists to compare their flammability in microgravity to their flammability on the ground. The data they collect could help keep future spacefarers safe when they embark on long-duration missions.