Dark matter dominated the structure in the early universe,Steinhardt said。For the first few billion years dark matter contained most of the mass of the universe You can think of ordinary matter a frothof an ocean of dark matter.The darkmatter dumpsand the ordinary matter falls into it.That to the formation of the stars and galaxies.Without dark matter , there would be virtually no structures in the universe
The nature of dark matter is ______ It cannot be seen or detected directly
Astronomers know it is there because of its______ on celestialobjects that can be seen and measured.
But the most dominating force of all in the universe is called dark energy, a recently ______ power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed.
51 A worry B move C puzzleD reject
52 A understanding B value C pattern D structure
53 A changedB described C designed D shaped
54 A in B for C ofD to
55 A make B keep C set D get
56 A written B called C identified D seen
57 A signed B stressed C acted D played
58 A believe B owe C feel D regard
59 A appearedB carriedC published D contributed
60 A elementB shape C formation D power
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