Name: 可能改写物理学的发现
Uploaded: 2014-04-01T15:10:50Z
Duration: 4 min 29 s
Description: 2014年3月17日，一群物理学家宣布了一个振奋人心的发现：宇宙暴涨理论的铁证数据，也是宇宙大爆炸的一条线索。对非物理学家们而言，这是什么意思呢？TED 邀请了艾伦．亚当斯在这个即兴演讲中简要地解释这样的发现，插图由 xkcd 的兰德尔•门罗绘制。

Two edits here. "14 billion years" and "13 billion years" refer to the same quantity: the time elapsed since the CMB  [Cosmic Microwave Background] was emitted. I bizarrely rounded differently in my head on the fly. In fact, the Big Bang took place about 13.798 +/- 0.037 billion years ago. 

(Aside: Those error bars should knock your socks off — determining the age of the cosmos with that accuracy by just looking at the night sky today is like you looking at me in this video and deducing my age in the video to within a couple of hours — that's insane!! Sherlock Holmes has nothing on cosmologists.)

The second edit is a cognitive slip that's all too common, and I could kick myself for perpetuating it: The "size" of the observed universe — the distance to the stuff that emitted the currently visible CMB 13.8 billion years ago — is not in fact 13.8 billion light-years. It's actually much larger — about 46 billion light-years — because the universe has continued to expand since the CMB was emitted. The stuff that emitted the CMB light we are just now seeing is thus much farther away.

"BICEP2 Press Conference"

2014年3月17日，一群物理学家宣布了一个振奋人心的发现：宇宙暴涨理论的铁证数据，也是宇宙大爆炸的一条线索。对非物理学家们而言，这是什么意思呢？TED 邀请了艾伦．亚当斯在这个即兴演讲中简要地解释这样的发现，插图由 xkcd 的兰德尔•门罗绘制。

可能改写物理学的发现

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