Samuti olid vaadeldud objektide hulgas mitmesugused plahvatustega seotud objektid: kataklüsmilised tähed, noovad, supernoovade jäänukudud ja neutrontähed. Lisaks sellele identifitseeriti ekstremaalset UV-kiirgust ka 36 aktiivse, Seyferti galaktika tuumaalast.
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Saanud nime Ameerika astronoomi Carl Keenan Seyferti (1911-1960) järgi.
A Seyfert galaxy has a quasar-like nucleus, but the host galaxy is clearly detectable. The original definition of the class (Seyfert 1943) was primarily morphological, i.e., these are galaxies with high surface brightness nuclei, and subsequent spectroscopy revealed unusual emission-line characteristics.
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