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