Educational Resources for Astronomy 101
AstronomyCenter.org is a collection of digital resources for college-level introductory astronomy faculty and students.
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The Class Action resources from the University of Nebraska provide a rich collection of in-class concept tests and interactive teaching tools.
Project CLEA develops laboratory exercises
in astronomy using digital data and color
images. Each CLEA
laboratory exercise includes a dedicated
computer program, a student manual, and a
technical guide for the instructor.
Arp 148, nicknamed Mayall's object, is the aftermath of an encounter between two galaxies, resulting in a ring-shaped galaxy and a long-tailed companion. The collision between the two parent galaxies produced a shockwave effect that first drew matter into the center and then caused it to propagate outwards in a ring. Arp 148 is located in the constellation of Ursa Major, the Great Bear, approximately 500 million light-years away.