Overview: NGC 3314

of "Lithograph: NGC 3314 – A Tale of Two Galaxies"
Lithograph: NGC 3314 – A Tale of Two Galaxies (PDF)
(7.2MB; Adobe Reader required)
This image from the Hubble Space Telescope shows a rare view of a pair of overlapping galaxies, called NGC 3314. The two galaxies look as if they are colliding, but they are actually separated by millions of light-years. The motion of the two galaxies indicates that they are both relatively undisturbed and that they are moving in markedly different directions. An inquiry-based classroom activity is included in the lithograph package.
Format(s) available: PDF
Grades: 11-12, but the material can be adapted for use in other grades at the teacher's discretion
How to use it in the classroom

Teachers can use Lithograph: NGC 3314 – A Tale of Two Galaxies as:

An example of overlapping galaxies. Use the inquiry-based classroom activity, "In Search of … Nature's Deception: Overlapping Galaxies," which 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 as many questions as possible about the features visible in the images. The students' questions can be used in a variety of ways. Here are a few suggestions:

• Ask students to find the answers to their questions by reading the back of the lithograph and/or the related materials listed below.

• Have students exchange papers so that each student has someone else's questions. Then have them find the answers to the other students' questions by reading the back of the lithograph and/or the related materials listed below.

• Ask for volunteers to read the questions as someone records them on the blackboard or on an overhead transparency sheet. Ask students to raise their hands if they have the same or a similar question. Count the number of raised hands and record the total next to the question. Once all the students' questions have been added to the list, ask them to search for the answers to their questions in the text on the back of the lithograph. When they have completed that task, ask them to decide if each of their questions was answered completely, answered partially, or not answered at all. Go through the original list and place an "A" in front of those questions that were answered completely, a "P" for those that were answered partially, and an "N" for those that were not answered at all. Determine if the most commonly asked questions were also answered completely. Encourage students to conduct further research to find answers to the unanswered questions.

A content reading tool. Have students read the back of the lithograph and write a quiz for the class.

Related materials

HubbleSite: "Chance Alignment Between Galaxies Mimics a Cosmic Collision"

HubbleSite news releases on interacting galaxies

Halton Arp's "Atlas of Peculiar Galaxies"

See the Galaxies section on the "Teaching tools" page.

Overview: NGC 3314