There are are at least seven artists named Nebula:
1) Nebula is a psychedelic / stoner rock band formed by guitarist Eddie Glass and drummer Ruben Romano upon departing Fu Manchu in 1997. Mark Abshire soon joined as the band's original bassist. Nebula have been on indefinite hiatus since early 2010 but have not broken up. In June 2019, the band released their first album since 2009, titled Holy Shit.
2) Nebula was an ambient supergroup based in Italy. Read more on Last.fm