Twin quasar and gravitational lensing

Description:

A short distance from the galaxy NGC 3079 in this photo, we can see two quasars that are a huge distance away from us. Two quasars? No. They are one and the same quasar that is 7.8 billion light-years away (redshift 1.41). A galaxy about halfway at 3.7 billion light-years, creates a gravitational lensing effect and sends us a second image of this same quasar, slightly shifted, like a mirage.