Starbursts, Interacting Galaxies and Active Galactic Nuclei (AGNs). Some history.
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Starbursts, Interacting Galaxies and Active Galactic Nuclei (AGNs)
Twinkle, twinkle, quasi-star,Biggest puzzle from afar.How unlike the other ones,Brighter than a trillion Suns.Twinkle, twinkle, quasi-star, How I wonder what you are! - George Gamow
Galaxies in collision/interacting/mergers
Computer simulation – interacting pair
M51 – the Whirlpool and companion
Carl Seyfert 1943
Radio galaxies and radio lobes