单词：critical density of the universe
单词：critical density of the universe 相关文章
What is extraordinary from our point of view is how well it turned out for us. If the universe had formed just a tiny bit differentlyif gravity were fractionally stronger or weaker, if the expansion had proceeded just a little more slowly or swiftlyt
万物简史
I should say that everything is just right so far. In the long term, gravity may turn out to be a little too strong, and one day it may halt the expansion of the universe and bring it collapsing in upon itself, till it crushes itself down into anothe
万物简史
Ranga-Ram Chary, U.S. Planck Data Center's project manager in California, recently discovered a mysterious glow by mapping the Cosmic Microwave Background, otherwise known as the light that was left over from a few hundred thousand years after the Bi
英语新闻
This dark energy doesn't behave like any other substance we know at all and acts more like antigravity force. 这种暗能量的性质与我们所熟知的其他物质完全不同，它更像是反重力。 We say that it has a gravitational pressure
TED演讲教育篇
Looking up at the night sky, we are amazed by how it seems to go on forever. 仰望夜空，我们为它的永无止境而感到惊讶。 But what will the sky look like billions of years from now? 然而数十亿年前的天空又会是什么样子呢
TED演讲教育篇
And this is how it works. Gravity is more powerful where there's more stuff. 这就是它怎么运作的。重力场的作用力更大，拥有比较多的物质。 So where you get slightly denser areas, gravity starts compacting clouds of hydrogen
TED演讲教育篇