The image shows two gravitationally interacting galaxies that happen to be oriented so they appear to form the number 10. Arp 147 appears in the "Atlas of Peculiar Galaxies," compiled by Halton Arp in the 1960s and published in 1966.
The left-most galaxy, or the "1" in this image, is relatively undisturbed apart from a smooth ring of starlight. It appears nearly on edge to our line of sight. The right-most galaxy, resembling a “0,” exhibits a clumpy, blue ring of intense star formation.
Included is an inquiry-based classroom activity that focuses on the image and text.
This Hubble Space Telescope image shows a pair of interacting galaxies that appears to form the number 10. The text describes the image and provides a brief explanation of why astronomer Halton Arp compiled his catalogue of odd-looking galaxies in the 1960s. Includes an inquiry-based classroom activity.
Teachers can use this lithograph as:
An example of interacting galaxies. Use the inquiry-based classroom activity called In Search of Peculiar Galaxies 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 as many questions as they can about the features visible in the images. The students questions can be used in a variety of ways. Here are a few suggestions:
A content reading tool. Have students read the back of the lithograph and write a quiz for the class.
HubbleSite press release: "Hubble Scores a Perfect Ten"
Telescopes from the Ground Up: Edwin Hubble’s Discovery that other Galaxies Exist
Astronomy Picture of the Day: The Double Ring Galaxies of Arp 147 from Hubble
Amazing Space resources by topic: Galaxies