Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 3073  ·  NGC 3079
Gravitaionally lensed Quasar (8 BILLION ly distance), Marten Amschler
Gravitaionally lensed Quasar (8 BILLION ly distance), Marten Amschler

Gravitaionally lensed Quasar (8 BILLION ly distance)

Gravitaionally lensed Quasar (8 BILLION ly distance), Marten Amschler
Gravitaionally lensed Quasar (8 BILLION ly distance), Marten Amschler

Gravitaionally lensed Quasar (8 BILLION ly distance)

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Description

Big thanks to @GalacticRAVE   for bringing this interesting DSO to my knowledge! One might think I am talking about the galaxy NGC_3079 ... but take a closer look and you will find two similar looking pale blue dots ;)

1960, scientists found some strange radio sources (comparable as emitted from stars) in an All-sky radio surveys. But the signals traveled way to far to originate from stars... so they were initially noted as "radio sources with no corresponding visual object". A few years went by until bigger telescopes could reveal the secrets of those "quasi-stellar objects": "Quasars" reside in centers of active galaxies. The incredible luminosity doesn't relate to thermonucelar fusion (as known from stars) but it is powered by super massive black holes. The consumption of gigantic gas clouds lead to a bright shining accretion disc (due to magnetic and thermal processes)... so bright in fact, that quasars are the brightest known objects in our universe. That is btw. the reason why they are widely used as reference points to define the International Celestial Reference Frame.

What you are seeing in the mouseover are Q0957+561 A/B. Both objects have first been observed in 1979. The scientists noticed their unusual close proximity... also their redshift, visible spectrum and radio signal characteristics were basically similar (even in my 8-inch capture they look nearly identical). On a later date it has been proven... the pale blue dots we are seeing are the same object! The "Twin Quasar" is a gravitational lensed object that appears as two images as a result of wrapping of space-time by the nearby galaxy YGKOW G1. It was the first directly observable (and depictable) effects of gravitational lensing, which was described in 1936 by Albert Einstein as a consequence of his 1916 General Theory of Relativity.
30 years of observation made it clear that image A of the quasar reaches earth about 14 months earlier than the corresponding image B, resulting in a difference of path length of 1.1 ly.

Another incredible aspect about this picture is that the Quasar has a distance of 8 BILLION light-years. That makes it the furthest object I've ever captured. Another prove that our scopes do a great job!

By the way, i recorded the acquisition session: https://www.youtube.com/watch?v=i_wT8AHfMq0 ;-)

Clear Skies!

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Title: Twin Quasar with Annotation

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Gravitaionally lensed Quasar (8 BILLION ly distance), Marten Amschler