The term "space rock" is a broad and somewhat vague description that can refer to several different types of music or artists. In its most literal sense, it refers to any type of music that has themes related to outer space, science fiction, or cosmic exploration. This could include electronic dance music, psychedelic rock, progressive rock, or even experimental ambient music.
However, the term is also used more loosely to describe a particular style of rock music that emerged in the late 1960s and early 1970s, characterized by long instrumental jams, distorted guitars, and often trippy or psychedelic lyrics. Bands such as Pink Floyd, Hawkwind, and Led Zeppelin are often associated with this style of music, which was popular among fans of the counterculture movement at that time.
Overall, while "space rock" can refer to a specific musical genre or themes related to outer space, it is also an umbrella term used to describe any type of music that falls under these broad categories.