<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Skip Navigation
You are viewing an older version of this Concept. Go to the latest version.

Life Cycles of Stars

Summarizes the life cycles of different types of stars.

Atoms Practice
Estimated4 minsto complete
Practice Life Cycles of Stars
This indicates how strong in your memory this concept is
Estimated4 minsto complete
Practice Now
Turn In
Einstein's Cross

Einstein's Cross

License: CC BY-NC 3.0

Sitting behind ZW 2237+030, the Einstein Cross seen as four images of the same quasar, is an example of a gravitationally lensed quasar.

News You Can Use

  • The Einstein Cross is an example of a gravitationally lensed quasar. A quasar is an energetic and active galactic nucleus that normally shows a very high red shift. Believed to be powered by the accretion of matter into black holes, quasars are known to be the most luminous objects in the universe.
  • The four images seen in the Einstein Cross is 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. This means that the 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: 


Explore More

Using the information provided above, answer the following questions.

  1. What exists at the center of a quasar?
  2. Describe gravitational lensing.
  3. 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?

Notes/Highlights Having trouble? Report an issue.

Color Highlighted Text Notes
Please to create your own Highlights / Notes
Show More

Image Attributions

  1. [1]^ License: CC BY-NC 3.0

Explore More

Sign in to explore more, including practice questions and solutions for Life Cycles of Stars.
Please wait...
Please wait...