Sitting behind ZW 2237+030, the Einstein Cross refers to the four images of the same quasar. It serves as an excellent example of the gravitational lensing phenomenon.
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- A quasar is an energetic and active galactic nucleus that normally shows a high redshift. They are also recognized as the most luminous objects in the entire universe.
- The four images seen in the Einstein Cross are a result of a galaxy in the foreground that is bending the light that is coming from the quasar. The bending of light due to a massive object is one of the concepts involved in general relativity. Light given off by an object on the other side of a massive object will be bent towards your eye like a lens.
- View an animation of the Einstein Cross at the link below:
- Learn how quasars are created at the video below:
Using the information provided above, answer the following questions.
- What exists at the center of a quasar?
- Describe gravitational lensing.
- If a star is observed to have a red shift, does this tell you what direction the star is moving relative to you? If so, what direction is it moving?