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Chapter 8 Review
| Question | Answer |
|---|---|
| Both reflecting and refracting telescopes ___________ and __________ visible light. | collect focus |
| Refracting telescopes use ____________________lenses. | convex |
| Reflecting telescopes use ___________________. | mirrors |
| Spectrographs help astronomers determine the ___________________ and ______________ of a star. | temperature chemical composition |
| 5. Astronomers can determine the composition and temperature of a star by using a _______________________. | spectrograph |
| A _____________________ is the distance light travels in a year. | light year |
| The apparent change in position of an object when viewed from two different places is called ____________________. | parallax |
| One indication that a planet may exist near a star is that the star has a _____________________ __________________ motion. | slight back and forth |
| Stars are classified according to their ______________, _________________, and ____________. | size, temperature and brightness |
| The hottest stars are ___________________ in color. | blue |
| All stars begin their lives as parts of _________________. | nebulas |
| __________________ is the force that tends to pull together the matter in a nebula. | Gravity |
| The lifetime of a star depends on its ________________. | mass |
| When a white dwarf stops glowing, it becomes a ______________________. | black dwarf |
| A ____________________ is the explosion of a dying giant of supergiant star | supernova |
| A____________________ star may form after a supernova explosion. | neutron |
| More than half of all stars are members of groups of two or more stars called ___________ __________. | star systems |
| A____________________ galaxy has a characteristic pinwheel shape | spiral |
| The Milky Way Galaxy is a________________ galaxy. | spiral |
| A galaxy that does not have a regular shape is classified as a____________________ galaxy. | irregular |
| Astronomers have inferred the age of the universe from how fast the universe ____________________. | expanding |
| The theory that astronomers have developed to describe the beginning of the universe is called the _______________________________. | big bang theory |
| One piece of evidence that supports the big bang theory is the observation that most galaxies are moving _________________ from one another. | away |
| According to the big bang theory, the universe began about _______________________ years ago. | 10 - 15 billion |
Created by:
lschramme
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