Interpretations of cosmic expansion: anchoring conceptions and misconceptions

Abstract

Teaching cosmology at the undergraduate or high school level requires simplifications and analogies, and inevitably brings the teacher into contact with at least one of the pedagogical interpretations of the expanding universe. The by far most popular interpretation holds that galaxies in an expanding universe are stationary, while space itself expands and thus causes the growing distances that characterize cosmic expansion. The alternative relativistic explosion interpretation regards cosmic expansion as a pattern of (relativistic) galaxy motion. The aim of this article is to discuss the two competing interpretations from the perspective of potential student preconceptions, taking into account both beneficial anchoring conceptions and potentially harmful preconceptions that can lead to misconceptions.

10 pages, 3 figures

References in corpus (5)

• Joining the Hubble Flow: Implications for Expanding Space
• Expanding Space: the Root of all Evil?
• Lightlike simultaneity, comoving observers and distances in general relativity
• Cosmic inflation and big bang interpreted as explosions
• Relatively complicated? Using models to teach general relativity at different levels