"Astronaut" by Simple Plan is a pop-punk song in the key of G major. It was released in 2011 as the second single from their album "Get Your Heart On!" The song was written by the band members Pierre Bouvier, Chuck Comeau, and Arnold Lanni. The lyrics convey a sense of feeling lost and disconnected, wishing to escape from reality and explore the unknown. The track features catchy guitar riffs and a powerful chorus. A interesting fact about the song is that it was inspired by a picture of an astronaut floating alone in space.