SUNSET: 
0
Photographer:
massimo.difusco
Location of Photo:
Ferrara (Italy)
Date/Time of photo:
14/12/2025 02:00
Equipment:
Konus 200/1000 @950mm, Player One Poseidon-C camera, Sky-Watcher Eq6r Pro Mount, Optolong L-Quad Enhance filter 442x180"
Description:
An interesting particular of the image is the Quasar Q 0957+561A, 9.197 billion years light travel time (Lookback). The light of this Quasar passes near a less distant galaxy, YGKOW G1 (and related galaxy cluster 3.7 billion light years away), that gravitationally 'lenses' the light and creates a double image of the Quasar (called QSO 0957+5608B and Q0957+561A). What we ‘see’ are actually both ‘lensed’ images. The true Quasar location (visual alignment) is actually between the ‘seen’ 561A and galaxy G1. The Twin Quasar was discovered in 1979 and it was one of the first directly observable effects of gravitational lensing, which was described in 1936 by Albert Einstein as a consequence of his 1916 General Theory of Relativity.
