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| researchers usually assume that the universe is homogeneous and isotropic. this assumption is known as the _____. |
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| the difference between the idea that the night sky should be as bright as the daysky and the actual appearance of teh night sky is known as ____. |
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| the stupednous, unmiaginably violent event, involving literally everyting in the cosmos is known as the ____. |
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| teh density corresponding to a universe in which gravity acting alone would be just sufficient to halt the present expansion is called the universe's _____. |
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| the universe appears to be expanding at an increasing rate |
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| the mysterious cosmic force cuasing the universe to accelerate, it carries energy, exerts a repulsive effect on the universe and causes empty space to expand |
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| in a high density universe, space is curved so much that it bends back on itself and closes off, making the universe finite in size. this is called a _____. |
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| a low density , saddle curved universe that is infinite in extent |
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| the radio hiss that penzias and wilso detected |
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| cosmic microwave background |
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| the production of elements heavier than hydrogen by nuclear fusion shortly after the big bang |
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| primordial nucleosynthesis |
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| During _____, the universe expanded enormously. |
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| a mixture of gases is placed in the upper bulb to simulate earth's primordial atmosphere and then energized by spark discharge elctrodes to simulate lightening. after about a week, amino acids, and other complex molecules are found in the trap at the bottom which simulates the primordial oceans into which heavy molecules produced in the overlying atmosphere would have fallen |
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| of all the star systems in our milky way galaxy, progressively fewer and fewer have each of the qualities typical of a long lasting technological society |
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| radio radiation leaks from earth into space because of the daily activities of our technological civilization |
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| some reasearchers have proposed that the interval between 18 cm and 21 cm is the best wavelength range for civilizaitons to transmit or listen |
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