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Chapter31 Review
Milky Way Galaxy
| Question | Answer |
|---|---|
| How old is the Milky Way Galaxy | 13-14 billion years |
| When the rate of expansion of the universe is known, it is possible to calculate the | age of the universe |
| Normal spiral | SO |
| Very elongated elliptical | E7 |
| Loosely wound arms and a small dim nucleus | Sc |
| Irregular galaxy | Irr |
| Tightly wound arm and large, bright nucleus | Sa |
| Barred Spiral | SB |
| Round elliptical | E0 |
| Elliptical galaxies are divided into subclasses based on ___________. | the ratio of their major and minor axes |
| Redshift shows that the universe is | expanding |
| The Milky Way's galactic nucleus is surrounded by a | nuclear bulge |
| Gigantic formation of clusters of galaxies hundreds of millions of light-years in size. | superclusters |
| Proposes that the universe looks the same on large scales to all observers and that it has always looked that way. | Steady-State Theory |
| Core of a galaxy in which highly energetic objects or activities are located. | active galactic nucleus |
| Study of the universe | cosmology |
| Model that says the universe began as fluctuation in a vacuum and expanded very rapidly for a fraction of a second before settling into a more orderly expansion. | inflationary universe |
| Persistent noise discovered in 1965 that is caused by weak radiation from all directions in space. | cosmic background radiation |
| States that the universe began as a point and has been expanding ever since. | Big Bang Theory |
| The Milky Way and Andromeda are both ________. | galaxies |
| Recent observations show that the rate of expansion of the universe is ________. | speeding up |
| The question about other objects existing in the sky was answered by Edwin Hubble in 1924. What did he discover in the Great Nebula in the Andromeda constellation? | Cepheid variable stars |
| How many major spiral arms are identified in the Milky Way Galaxy? | 4 |
| What group of galaxies is the Milky Way in? | the Local Group |
| How old is the sun? | 5 billion years |
| Trace amounts of heavy elements is a characteristic of what type of star? | population 2 |
| What are the three possible outcomes for the universe? | open universe, closed universe, and flat universe |
| Cosmic background radiation has a wavelength of approximately 1mm, which makes it _______. | microwave radiation |
| Population 2 stars are found in the | bulge and halo |
| If the average density is higher than the critical density, the universe is __________. | closed |
| The sun is located about __________ from the galactic center. | 28,000 ly |
| The globular clusters are located in the | halo |
| What is the ratio that expresses the mass of the Sun compared to the mass of the Milky Way? | 1:100 billion |
| Galaxies are characterized by their | shape |
Created by:
ceadams00
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