Term
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Definition
| a system of stars, gases, and dust held together by gravity |
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Term
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Definition
| an interstellar cloud of dust and gases where stars can form |
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Term
| Galaxies are classified by their shapes. What are they called? |
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Definition
| spiral, irregular, & elliptical |
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Term
| The stars and all the other matter in a galaxy are held together by ________? |
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Definition
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Term
| Compare the Sun and Betelgeuse for temperature, color and luminosity. |
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Definition
| Sun is dimmer, hotter 6000K, smaller. Betelgeuse is brighter, cooler 3000K and bigger (supergiant) |
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Term
| How big is our sun compared to other stars? List the 4 sizes of stars. |
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Definition
| Sun is medium sized and average. White dwarf, main sequence, giant, supergiant |
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Term
| Where is the Sun located in the Milky Way galaxy? |
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Definition
| About 30,000 light years from the center near the outer edge of the galaxy but not on the outer edge. |
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Term
| The _____ is a average sized, yellow, main sequence star that is CLOSE to us. |
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Definition
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Term
| Many of the stars seen in the night sky are much larger than our Sun, but appear much smaller. What does the Sun appears larger than larger stars? |
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Definition
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Term
| How does our Sun compare in size to other stars? |
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Definition
| It is an average sized main sequence star that is average in temperature and average in brightness. |
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Term
| What percentage of visible stars are closer to Earth than the Sun? |
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Definition
| 0%, the sun is the closest star |
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Term
| All observable objects outside our galaxy, when viewed from Earth, have their spectra shifted to slightly longer wavelengths. Astronomers have concluded that this is evidence that all objects in the universe are ________. |
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Definition
| moving away from the Earth |
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Term
| Which of the following characteristics of elements is used by astronomers to determine the chemical composition of distant stars? |
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Definition
| All elements emit certain wavelengths of light when heated. |
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Term
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Definition
| The distance light travels in a year. |
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Term
| What would a light year be useful in measuring? |
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Definition
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Term
| How long does it take the light from a star 37 light years away from the Earth, to reach the Earth? |
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Definition
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Term
| All the galaxies we observe from Earth emit light that is shifted, to varying degrees, to longer wavelengths. This evidence is used to support the Big Bang Theory because it shows that galaxies we observe are _________. |
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Definition
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Term
| The theory of the origin of the universe that is most popular among space scientists suggests that our universe originated how long ago? |
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Definition
| Approximately 13 billion years ago |
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Term
| Cosmic Microwave Background Radiation (CMBR) is the term used to describe the residual microwave radiation observed everywhere in the universe that seems to have no single source. The observation of CMBR is used as evidence of the Big Bang Theory because _________. |
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Definition
| it is believed to be radiation left over from the rapid expansion of matter. |
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