The Universe & Galaxies SOL 14

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The Universe & Galaxies
SOL 14
Fundamental Concepts and Skills
1. Many types of observations are needed to better
understand our universe.
 Much of our information about our galaxy and the universe comes
from ground-based observations, using optical and radar
telescopes as well as spectroscopes.
 The Hubble Space telescope has greatly improved our
understanding of the universe because it is located above the
earth’s atmosphere.
Reading
Chapter 28
2. Define a light year as the distance light travels in one year. It is
the most commonly used measurement for distance in astronomy.
Chapter 28
3. Explain that the Big Bang Theory and the solar nebular theory
are the best current hypotheses for the origin of the universe and
origin of the solar system respectively.
Chapter 28
4. Recognize that the Big Bang Theory states that the universe began
12-15 billion years ago as a dense sphere that expanded and
eventually condensed into galaxies.
Chapter 28
5. Understand that :
 Galaxies are collections of large numbers (billions) of stars.
 Identify the basic types of galaxies as spiral (have arms),
elliptical (round or oval shaped), and irregular.
Chapter 28
6. Understand that :
 Stars have a finite lifetime and evolve over time.
 The mass of a star controls its evolution, length of its lifetime, and
ultimate fate.
 Stars form by condensation of interstellar gas.
Chapter 28
7. The sun, like other stars, consists largely of hydrogen gas. Its
energy comes from nuclear fusion of hydrogen to helium.
Chapter 28
8. The solar system is located in the Milky Way Galaxy.
Chapter 28
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