Does the Milky Way have an active galactic nucleus? Is it or is it a type 1 or type 2 Seyfert galaxy?

Galaxies with an active galactic nucleus are known as quasars and Seyfert galaxies.

An active galactic nucleus is where massive amounts of energy are released when material falls into an accretion disc, which is formed when material falls into a supermassive black hole at the center of most large galaxies. The disc is called an accretion disc if material falls into it and is heated by friction and gravitational forces.

A galaxy needs a lot of material falling into its black hole in order for its nucleus to be active; this is usually the case only in very young galaxies or as a result of galaxy collisions.

The Milky Way's nucleus may have been active during the galaxy's younger years; it may indeed become active again when the Milky Way and Andromeda galaxies collide in approximately 4 billion years; it may also briefly become active if a dust cloud passes near enough to the supermassive black hole to form an accretion disc.

Yes, the Milky Way has an active galactic nucleus (AGN), although it is not as active as those found in some other galaxies. The Milky Way is classified as a Seyfert galaxy, specifically a type 2 Seyfert galaxy. In type 2 Seyfert galaxies, the central supermassive black hole is believed to be obscured by a thick disk of gas and dust, which limits the visibility of the nucleus.