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22.2 Stars Change Over Their Life Cycles • CLICK ME!!! All stars are balls of glowing gas that produce or have produced energy by fusion The amount of light and its distance determine how bright a star appears from Earth. We classify stars by their characteristics Sizes range from super giants to white dwarfs Each stars color is determined my its temperature Star Temperatures and Color HOT! What is PARALLAX? • The apparent shift in the position of an object when viewed from different locations. • Try this! Close one eye at a time and focus on a single object. Blink back and forth quickly. What happens!? Does the object appear to move? How do astronomers use parallax to measure distance of stars? To plot a star’s position from opposite sides of Earth’s orbit. picture Sentence: Gravity pulls particles closer together in some regions of a nebula. Nebula: cloud of gas and dust in which stars may form Three stages of a lower-mass star: Main sequence Giant Star White Dwarf Neutron Stars • Emits radiation • Visible light • Extremely dense • mass= 1-3 times that of the Sun • Core left after supernova Black Holes • NO radiation • invisible • mass= more than 3 times the Sun