Students know the evidence indicating that the color, brightness, and evolution of a star are determined by a balance between gravitational collapse and nuclear fusion. D. Solar System 1. Students know the solar system is located in an outer edge of the disc-shaped Milky Way galaxy, which spans 100,000 light years. Inner Planets 4d. Outer Planets 1d.
Students know the evidence indicating that the planets are much closer to Earth than the stars are.
Students know how the differences and similarities among the sun, the Terrestrial planets, and the gas planets may have been established during the formation of the solar system 1e. Students know the Sun is a typical star and is powered by nuclear reactions, primarily the fusion of hydrogen to form helium. E. Exploring Space 1. Collecting evidence 1d. Students know the evidence indicating that the planets are much closer to Earth than the stars are.