Cosmic Girl took off from Virgin Orbit's Mojave facility and performed everything but the actual launch. Referred to as a cryogenic captive carry test, LauncherOne was loaded with liquid nitrogen that is a similar temperature to the propellent it will actually use to launch––liquid oxygen. This "would pose less of a risk in case anything were to go wrong despite all of our planning — in our LOX tanks for both stages," according to a blog post from Virgin Orbit.