About This Chapter
Galaxies, Stars and Solar Systems - Chapter Summary and Learning Objectives
In this chapter, our knowledgeable video instructors explain how galaxies form and the different types of galaxies. You'll be introduced to red shift, background radiation, expansion, and other evidence for the Big Bang Theory, as well as how nuclear synthesis formed stars in the early universe. This chapter will discuss expanding and contracting universes and changes in the solar system over time.
You'll learn about the radio, refracting, and reflecting telescopes and how they're used to make observations about galaxies and solar systems. As you progress through the chapter, you'll learn how spiral, elliptical, and irregular galaxies form. When you finish this chapter, you should be able to:
- Describe the current theory of how the universe formed and the evidence for this theory
- Differentiate between types of stars by their size, color, and life cycle
- Understand the structure of the sun
- Name the stages of the life cycles of the sun, of supernovas, and of supergiant stars
- Understand both sides of the debate over planets orbiting other stars
Our video lessons include a self-assessment quiz so you can see how well you've learned the lesson as you go. Each lesson also includes a full transcript of the video so you can follow along if you wish. Videos are short and simple to navigate, with tags that let you navigate between the video's main points. In case you get stuck on a key word, key words and phrases are clickable and link to text lessons that clarify these terms.
1. Galaxy Formation: Spiral, Elliptical & Irregular Galaxies
This lesson explains how galaxies form, starting with the Big Bang. You'll also learn about the solar nebula hypothesis and three galaxy types, including spiral, elliptical, and irregular galaxies.
2. Origins of the Universe: The Big Bang and Expanding & Contracting Universes
Students will learn the origins of the universe, the Big Bang theory, the timeline of the universe, how the universe is still expanding to this day, and what astronomers expect the universe to look like in the future.
3. Evidence for the Big Bang Theory: Background Radiation, Red-Shift and Expansion
Discover what evidence exists to support the Big Bang theory of the birth of the universe. Learn how cosmic background radiation, the red shift of light and the ongoing expansion of the universe led scientists to believe that the universe was started with the Big Bang.
4. Supernova and Supergiant Star Life Cycle
Learn about one of the biggest explosions known to humankind - a supernova. Follow a star's life cycle and learn how a star changes from a red giant to a supernova to a black hole or neutron star.
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Other chapters within the Intro to Astronomy: Help and Review course
- The History of Astronomy: Help and Review
- How Scientists Think and Work: Help and Review
- Matter, Energy, and Astronomy: Help and Review
- Light in Astronomy: Help and Review
- Newton's Laws in Astronomy: Help and Review
- Rotational Motion and Astronomy: Help and Review
- Orbits, Tides, and Gravity: Help and Review
- Relativity in Time and Space: Help and Review
- Conservation Laws in Astronomy: Help and Review
- Earth's Spheres and Astronomy: Help and Review
- The Earth, Sky, and Moon: Help and Review
- The Moon's Form and Phases: Help and Review
- The Atmosphere on Earth and Other Planets: Help and Review
- Influences on Climate: Help and Review
- The Sun and Energy: Help and Review
- Star Types and Significance: Help and Review
- Measurement of Star Qualities: Help and Review
- The Birth and Life of Stars: Help and Review
- Star Death and Stellar Remnants: Help and Review
- Formation of the Solar System: Help and Review
- Components of the Solar System: Help and Review
- Small Celestial Bodies in the Solar System: Help and Review
- The Milky Way Galaxy: Help and Review
- Characteristics of Galaxies: Help and Review
- Life & the Universe: Help and Review
- Navigation and Timekeeping in Astronomy: Help and Review
- Telescopes: Help and Review