Misc: as what is california also known?

Questions

A massive ensemble of hundreds of millions of stars, all gravitationally interacting, and orbiting about a common center?

'Baby It's You' was just one of the many hits of the early 60's for this girl group?

'Slow Ride' was Foghats biggest hit from this album released in 1975?

Any of a group of composite organisms made up of a fungus and an alga living in symbiotic association (Symbiosis)?

Acronym for microwave amplification by stimulated emission of radiation, a device that amplifies or generates microwaves or radio waves?