Fast moving gases that can travel in space are referred to as molecular clouds, which are large aggregates of gas and dust that are found throughout the interstellar medium. These gas clouds are primarily composed of hydrogen and helium, with trace amounts of other elements. They serve as the nurseries for star formation, as the process of star formation begins within these molecular clouds.

These fast-moving gases can travel through the emptiness of space due to their high thermal energy. The particles within the molecular clouds are in a state of constant motion, colliding with each other and possessing high kinetic energy. This energy provides the necessary momentum to overcome the gravitational pull of their surroundings, allowing them to drift and move through space.

The existence of fast-moving gases in the interstellar medium is crucial for the continued process of star formation and cosmic evolution. Molecular clouds are essential components in understanding various astrophysical phenomena, including the formation of stellar systems, the evolution of galaxies, and the chemical composition of the universe.