This image shows Abell 2744, a cluster of galaxies that provide the 'lens' needed to image the faint galaxies behind the cluster.
This image contains multiple examples of gravitationally lensed galaxies, as shown by the many blue streaks across the picture.
Included is an inquiry-based classroom activity that focuses on the image and text.
This image from the Hubble Space Telescope shows the Abell 2744 cluster of galaxies. This massive cluster acts as a gravitational lens by bending the light coming from the faint galaxies located behind the cluster. Scattered among the cluster galaxies are blue streaks of light which are the distorted images of distant galaxies. This long-exposure image was the first of a set of Hubble Frontier Field observations of massive galaxy clusters. The program is designed to study faint, early galaxies revealed by gravitational lensing. The lithograph includes a classroom activity.
Teachers can use this lithograph as:
An example of a galaxy cluster. Use the inquiry-based classroom activity called In Search of Galaxy Clusters that is included with the PDF lithograph.
An engagement tool in an inquiry-based lesson. Have students study the images on the lithograph. Ask them to write down any questions they have about the images. When the students are finished, their questions can be used in a variety of ways:
A content reading tool. Have students read the text on the lithograph and then write a quiz for the class.
HubbleSite press release: "Hubble's First Frontier Field Finds Thousands of Unseen, Faraway Galaxies"
Star Witness News: "Frontier Fields: Hubble Goes Deep"
Blog: Frontier Fields
Amazing Space resources by topic: Galaxies