宇宙是如何开始的?

“刚开始”前的1920 – 这些话并没有在我们对宇宙的科学认识的地方。天文学家认为,宇宙是永恒不变的。我们知道只有一 星系 和几百万可见 星级,这是我们观察到的宇宙范围。

天文学家埃德温哈勃然后观察,对红移,遥远的星系相互远离超速,制定礼貌 哈勃定律 来解释宇宙的均匀膨胀。 红移 只是指的是一个遥远天体的对更长的时间,或者更红,波长的多普勒效应致意转变。

与此同时,物理学家爱因斯坦刚刚完成了他的一般理论 相对论,其中提供了一个模型有限的,宇宙形成均匀的 重力。奠定了一个新发现和新理论,未来的几十年里最基础小雪这些努力。

我们的现代科学对宇宙的认识提供了通过时间一类的路线图。总部设在哈勃和爱因斯坦和作为轻元素和宇宙微波背景辐射的发现证实了这样的丰富,这张地图点回137亿年的事件,我们的认识 大爆炸.

在这个古老的过去一点,有没有这回事,时间或空间。目前只是一个单一的热点,凝聚点 – 奇点 – 包含在宇宙中所有物质。此外,所有四个(即引力,电磁力,强,弱力)的基本力量是作为一个单一的统一力量。这个统一的时期,称为 普朗克时代,历时10-43 秒。然后,宇宙扩张的速度快于光速的速度,从亚原子到越来越多高尔夫球球大小几乎瞬间。科学家称此为 通货膨胀时期.

宇宙然后扩大在亚原子粒子的过热洪水向外。大爆炸后3秒,这些粒子的空间足够冷却,形成元素。大约有300亿年后,恒星和星系形成,以及。有关这些步骤的详细信息开始,(读 如何在大爆炸理论工程.

大爆炸理论还提供了宇宙是如何产生的最佳模式,但它不是唯一的理论上我们。例如, 稳态理论 有一个一致的密度为蓝本出现扩大,由于新的问题不断产生的宇宙。对它的支持,但是,大部分消失了,对发现的感谢 宇宙微波背景 (中巴)于1965年。中巴在本质上,早期的,膨胀的宇宙辐射的签名。

该 Ekpyrotic模型 由于宇宙形成的建议在第四维的两个单独的宇宙碰撞。而 大反弹理论 表明我们的宇宙是一个永恒的大爆炸和大循环陷入紧缩。

你可以认为这种理论和码头延伸到未知的宇宙模型。有些提供足够坚实的基础我们去观察和测试,我们逐步确定宇宙的确切位置以及我们在上面。

来源

* “埃德温哈勃鲍威尔。” EdwinHubble.com。 2002年5月3日。 (四月三十日,2010年)

http://www.edwinhubble.com/hubble_bio_001.htm

* “历史的宇宙时间表。”深空PBS的奥秘。 (四月三十日,2010年)

http://www.pbs.org/deepspace/timeline/

* Nave, Rod.早期活动的“模型”。遗传筛选组超物理。 (四月三十日,2010年)
http://hyperphysics.phy- astr.gsu.edu/Hbase/Astro/planck.html的C7#

* “科学证据的一个开始。”哈佛楼。 (四月三十日,2010年)

http://www.harvardhouse.com/Scientific_Evidence_for_Beginning.htm

* “大爆炸”。美国航空航天局。 2010年4月5日。 (四月三十日,2010年)

http://science.nasa.gov/astrophysics/focus-areas/what-powered-the-big-bang/

* 特纳,迈克尔S“宇宙的起源。”科学美国人。 2009年9月。 (四月三十日,2010年)

http://www.scientificamerican.com/article.cfm?id=origin-of-the-universe

* “宇宙101:大爆炸理论。”美国航空航天局。 2010年4月16日。 (四月三十日,2010年)

http://map.gsfc.nasa.gov/universe/

* Wanjek,克里斯托弗。“占有有利地位,宇宙的第一一瞬间。”美国航空航天局。 2006年3月16日。 (四月三十日,2010年)

http://www.nasa.gov/vision/universe/starsgalaxies/wmap_pol.html

Posted: 五月 22nd, 2010
Categories: 科学, 自然
Tags:
Comments: 58 Comments.
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