Term
| what color are the coolest stars |
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| stars appear to move in the sky because |
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| a star moving away from the earth has a spectrum that is |
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Definition
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| during the main sequence stage how is energy generated in a stars core |
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Definition
| hydrogen fuses into helium |
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Term
| how long would a star with the suns mass stay on the main sequence |
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Definition
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Term
| after its temperature rises to 10,000,000C a protostar becomes a star when |
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| a large bright star whose hot core has used most of its hydrogen is a |
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Definition
| stars, dust, and gas bound together by gravity |
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Term
| what does the energy emitted by a quasar suggest |
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Definition
| the presence of a giant black hole |
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Term
| what makes up most of the universe |
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Definition
| dark energy and dark matter |
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Term
| by analyzing the light that a star emits, astronomers can determine |
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Definition
| the composition and temperature of a star |
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Term
| objects, such as stars, moving toward an observer |
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Definition
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Term
| what is apparent magnitude |
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Definition
| the brightness of a star as it appears from earth |
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Term
| what is important about hubbles discovery that there is a red shift in the spectra of galaxies |
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Definition
| it suggests that the universe is expanding |
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Definition
| apparently fixed, recognizable patterns of stars and the regions of space around them |
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Term
| the observed change in the frequency of a wave when either the source or observer is moving is known as |
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Definition
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| what can parallax be used to calculate |
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Definition
| the distance to stars that are extremely far away |
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Definition
| contains few young stars, has little dust and gas, and is elongated |
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| when the outward force due to fusion and radiation balances with the inward force of gravity in a star is said to be experiencing |
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Definition
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Term
| approximately how many kilometers are there in a light year |
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Definition
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Term
| what did hubble discover in the 1920s |
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Definition
| red shift in spectra of galaxies |
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Term
| astronomers believe that cosmic background radiation formed |
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Definition
| shortly after the big bang |
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Term
| a rapidly spinning neutron star that emits bursts of radio and optical energy is a |
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Definition
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| in order to analyze starlight, astronomers direct it through |
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Definition
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| the beginning of ____ marks the birth of a star |
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Definition
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| the idea that all matter and energy was compressed into a small volume at one time billions of years ago and then exploded and began to expand is called |
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| a star that has collapsed to the point where electrons and protons are smashed together is a |
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| ursa major and draco are examples of |
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| what are stars that are always visible in the night sky and circled the north star in the northern hemisphere |
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Definition
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Term
| how far from the earth is the closest star besides the sun |
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Definition
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Term
| what does a stars visibility depend on |
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Definition
| brightness and distances from earth |
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Term
| why do astronomers use the hr diagram |
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Definition
| to describe the life cycle of stars |
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Term
| how long will a star with a mass the same as our sun stay on the main sequence |
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Definition
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Term
| if you look at the same region of the sky for several nights in a row what happens to the positions of the stars in relation to one other |
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Definition
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Term
| which type of galaxy is the most common and which type is the least common |
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Definition
| spiral is most and irregular is least |
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Definition
| the coldest temp possible |
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Term
| what are among the most distant objects that has been observed from earth |
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Definition
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| object at the center of some galaxies that produce energy at a high rate |
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Definition
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Term
| a neutron star that emits radio waves |
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Definition
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Term
| a shrinking spinning region of space with a central concentration of matter |
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Definition
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| a group of stars in a recognizable pattern |
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Definition
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Definition
| cosmic background radiation |
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Term
| a star group of no particular shape rich in dust and gas |
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Definition
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| a large explosion which causes a star to become suddenly bright |
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Definition
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| the theory of all matter and energy exploded from a small compressed volume about 14 billion years ago |
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Definition
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Term
| a star group of a nucleaes of bright stars and arms containing young stars |
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Definition
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Term
| the distance light travels in a year |
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Definition
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Term
| a group of stars in a recognizable pattern |
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Definition
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Term
| object at the center of some galaxies that produces energy at a high rate |
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Definition
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