At the end of this activity, students should be able to: û explain what is the Milky Way. û describe the structure of the Galaxy. û name the different types of galaxies. û describe the position of the Earth and the Sun in the Universe. û state Hubble's Law. û state the basic observations that indicate that the Universe is expanding. û describe the different cosmological models: close, open and flat.

Originally released by Learnetic, 2016.