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In this lesson, students consider observations and inferences to determine the support for each of two theories on the origin of the universe: Steady State and Big Bang. Working with partners, students draw from a set of Evidence cards (master is provided, which needs to be copied and cut into cards) and decide if the statement describes direct evidence as an observation/experiment or if it describes an inference or interpretation. They then look at two models describing the origin of the universe, and then assign Evidence cards to each theory (with blank cards provided for evidence they believe applies to both models). Students then review each others work and discuss. This lesson is part of the Cosmic Times teachers guide and is intended to be used in conjunction with the 1955 Cosmic Times Poster.