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Hubble's Expanding Universe: The Big Bang

Astronomer Edwin Hubble determined two things that shook the foundations of astronomy: that there are billions of galaxies outside of our own, each containing billions of stars; and that the universe is actually expanding. In this video segment, which uses footage from NOVA and NASA, learn how Hubble's findings laid the foundation for the Big Bang theory.

The web page is located within Teachers'Domain, an online educational resource produced by WGBH Boston. It has two related components ? collections and courses ? that help teachers enhance their students' learning experiences and advance their own teaching skills. The Teachers' Domain collections include classroom-ready multimedia resources for use in lessons or independent study. Registration is free for everyone (teachers, students, parents).