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匿名使用者 發問時間: 社會與文化語言 · 1 0 年前

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For five years, the Wilkinson Microwave Anisotropy Probe (WMAP) has been mapping cosmic microwave back-ground radiation, the ubiquitous afterglow of the Big Bang. In March, the WMAP team released new data that provide the most detailed snapshot of what the universe was like as a trillionth-of-a-second-old newborn. The new portrait expands on the probe’s initial results from 2003, which showed fluctuations in the microwave background caused by events 400,000 years after the Big Bang. Since 2003, WMAP researchers have made more precise energy measurements of the microwaves that allow them to look farther back in time. Led by Charles Bennett of Johns Hopkins University, the team accounted for distortions in the microwaves due to collisions with distant clouds of electrons. As a result, researchers could study signals 100 times weaker than what was previously detectable. The findings suggest that the first stars lit up around 400 million years after the Big Bang, 200 million years later than originally estimated. The analysis also yielded a breakdown of the cosmic makeup: The universe consists of 22 percent dark matter and 74 percent dark energy. Dark energy seems to cause the expansion of the universe to accelerate, while dark matter helps hold galaxies and galaxy clusters together. And what of the other 4 percent? That’s plain old matter-the stuff we’re made of.

Stephen Ornes

1 個解答

評分
  • 1 0 年前
    最佳解答

    5 年以來,威爾金森微波Anisotropy 探查(WMAP) 是繪圖宇宙微波背面地輻射,創世大爆炸理論的無所不在的余輝。 在3月內,WMAP 隊釋放提供最詳述的宇宙作為新生的第1萬億一2 老看起來象的快照的新數據。 這幅新肖像詳述來自2003的probe s 最初結果,這顯示在在創世大爆炸理論之後400,000 年事件引起的微波背景方面的波動。 從2003年起,WMAP研究人員已經做允許他們看起來遙遠的過去的微波的更準確的精力尺寸。 由約翰霍普金斯大學的查理斯‧貝內特領導,隊由於與遠的大堆電子相撞在微波裡解釋變形。 因此,研究人員能研究比以前能發現的弱100 倍的信號。 結論表明第一個星在在創世大爆炸理論之後4億年左右點亮,2億年比最初晚估計。 分析也產生這種宇宙化妝品的故障︰ 宇宙由百分之22的黑的事情和百分之74的黑的能量組成。 深熱量好像引起加速的宇宙的擴大,深事情幫助舉行星系和星系當時聚在一起。 其他百分之4怎么樣? 舊表面粗糙的明白的That s 材料we re理解。

    史蒂芬‧奧恩

    2007-04-22 04:58:26 補充:

    你的文章太長

    我沒辦法全部po給你耶

    如果你要我可以寄到信箱給你

    2007-04-22 05:00:20 補充:

    應該可以啦

    全部都在上面

    參考資料: DR.EYE
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