Astronomers have discovered the largest known structure in the universe, a clump of active galactic cores that stretch 4 billion light-years from end to end. The structure is a light quasar group (LQG), a collection of extremely luminous Galactic Nulcei powered by supermassive central black holes.
Aegir, Norse Lord of the Sea Aegir literally means ‘sea’. In Norse cosmology, Aegir is the presiding Spirit of the Ocean. He may also be understood as actually ‘being’ the Ocean. Aegir is incredibly ancient, even primeval. His nature as a deity is unclear; He is sometimes called a ‘Jotun’ (giant), but He may be so old that He predates Jotuns or any other known classification.
The Cartwheel galaxy as seen by 3 space telescopes. 100 million years ago, another, smaller galaxy tumbled through the Cartwheel galaxy and left behind "ripples" of star creation. The outer ring is the first ripple, with high ultraviolet output, and the inner yellow spot is from the second ripple, which was smaller and high in infrared output. From NASAimages.org #space #cartwheel | http://exploringuniversecollections.blogspot.com