Pershing Astr. 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What does a star's color tell us? | its temperature
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| What star is the hottest? | a main-sequence blue star
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| According to the big bang theory, about how old is the universe? | 13.7 billion years old
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| What kind of galaxy do scientists think the Milky Way is? | a spiral galaxy
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| Of the following, which one is the largest--galaxy, nebula, neutron star or globular cluster | galaxy
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| Where are cool, bright, huge red stars appear on the H-R diagram? | top, right
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| Why are black lines on the absorption spectrum? | black lines show were colors of light are absorbed by a star's atmosphere
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| What do the pattern of lines tell us? | what kinds of elements are in the star's atmosphere
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| Name the 3 major types of galaxies identified by Edwin Hubble? | spiral, elliptical and irregular
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| What do elliptical galaxies and the haolos of spiral galaxies have groups of stars called what? | globular clusters
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| Names the sequence of a star's life from earliest to latest? | main sequence, red giant, white dwarf
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| How do new stars form? | They form from material from old stars
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| What is found along the spiral disk of galaxies? | open clusters
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| What magnitude indicates the brightest star? | -6
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| What is a star's apparent shift called? | parallax
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| How do astronomers classify galaxies? | their shape
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| What kind of galaxy is the Milky Way? | spiral galaxy
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| What does the H-R diagram graph? | a star's temperature and brightness
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| What is the study of the origin, structure and future of the universe? | cosmology
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| What is absolute magnitude? | the brightness of a star at 32.6 light years from Earth
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| What is light-year? | the distance that light travels in one year
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| What is apparent magnitude? | the brightness of a star seen from Earth
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| What is main sequence? | a diagnonal pattern on the H-R diagram where most stars appear
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| What is the black hole? | an object so massive and dense that not even light will escape the gravitational pull
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