Steinhardt said it is believed that following the Big Bang，the theoretical _7_ of the universe，dark matter caused particles to clump together．That set up the gravitation processes that led to the formation of stars and galaxies．Those stars，in turn，created the basic chemicals，such as carbon and iron．that were _8_ to the evolution of life．
“Dark matter dominated the formation of structure in the early universe．”Steinhardt said．“For the first few billion years dark matter contained _9_ of the mass of the universe．You can think of ordinary matter as a froth of an Ocean of dark matter．The dark matter clumps and the ordinary matter falls into it．That led to the _10_ of the stars and galaxies．”
Without dark matter,“there _11_ be virtually no structures in the universe．”
The nature of dark matter is _12_．It cannot be seen or detected _13_ ．Astronomers know it is there because of its effect on celestial objects than can be seen and measured．
But the most dominating force Of _14_ in the universe is called dark energy．a(chǎn) recently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed．
One scientist said it is clear now _15_ dark matter and dark energy engaged in a gravitational tug of war that，eventually，dark energy won．
詞匯 ：
intergalactic／adj．銀河間的 gravitation／n．地心吸力，萬有引力
pivotal／adj．關(guān)鍵的 froth／n．泡沫
owe／v．把……歸功于 celestial／adj．天體的
clump／v．凝聚成塊
1． A)space B)movement C)forces D)speed
2． A)about B)in C)for D)within
3． A)waits for B)longs for C)accounts for D)looks for
“Dark matter dominated the formation of structure in the early universe．”Steinhardt said．“For the first few billion years dark matter contained _9_ of the mass of the universe．You can think of ordinary matter as a froth of an Ocean of dark matter．The dark matter clumps and the ordinary matter falls into it．That led to the _10_ of the stars and galaxies．”
Without dark matter,“there _11_ be virtually no structures in the universe．”
The nature of dark matter is _12_．It cannot be seen or detected _13_ ．Astronomers know it is there because of its effect on celestial objects than can be seen and measured．
But the most dominating force Of _14_ in the universe is called dark energy．a(chǎn) recently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed．
One scientist said it is clear now _15_ dark matter and dark energy engaged in a gravitational tug of war that，eventually，dark energy won．
詞匯 ：
intergalactic／adj．銀河間的 gravitation／n．地心吸力，萬有引力
pivotal／adj．關(guān)鍵的 froth／n．泡沫
owe／v．把……歸功于 celestial／adj．天體的
clump／v．凝聚成塊
1． A)space B)movement C)forces D)speed
2． A)about B)in C)for D)within
3． A)waits for B)longs for C)accounts for D)looks for