Micron is short for micrometer, one-millionth of a meter, or 1 x 10-6(denoted µ). Since the metric system is very rational, there are 1,000 microns in a millimeter and 10,000 microns in a centimeter. What does one-millionth of a meter look like? Let’s start with things we ca...
Our local star, however, is also unimaginably huge. At highway speed, it would take almost two years to drive from one side to the other. Compared toEarth, the Sun is a monster; it’s a giant nuclear fusion reactor that has enough hydrogen fuel to continue uninterrupted burning like th...
We tend to hold inventors in high esteem, but often their discoveries were the result of an accident or a twist of fate. This is true of many everyday items, including the following surprise breakthroughs. From the microwave oven to the Slinky, many products are an accidental invention. Let...
How big is your research group, Alice? 2017年高考英语浙江卷(11月) 听力 原文 How can a participant get a free meal? 2016年高考英语浙江卷(10月) 阅读理解 阅读B 题设 How can Sabrina reach her sister now? 2017年高考英语浙江卷(11月) 听力 题设 How can the process of Steve's recording b...
Transcript: How Big is the Universe? Download the transcript Fraser Cain:We’re ready to complete our trilogy of discovery about the universe. We’ve learned that it has no center; rather everywhere is its center and nowhere. We discovered that the universe seems to be flat. It not open,...
tenth the usual rate. The oldest light we can see is the cosmic microwave background, which has been traveling for 13 billion years and redshifted by a factor of 1100. We can’t see any farther with light; the CMB is like the blue of the sky, completely overwhelming the sky behind ...
aThis is even more important in light of the fact that China’s ratio of energy use to GDP – energy intensity- is one of the highest in the world according to the International Energy Agency, largely due to industrial consumption. 这根据事实是更加重要的能量利用中国的比与国民生产总值-能量强...
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Usually it is this big distance that people mean when they ask for the size of the universe. This is known as the co-moving distance. Of course, we can only see so far. So, how far can we see? The most distant light we are able to observe is from the cosmic microwave background...
What Happens When You Put Plastic in a Microwave Did Russia Use Microwave Weapons Against America? Matt Blitz Matt is a history, science, and travel writer who is always searching for the mysterious and hidden. He's written for Smithsonian Magazine, Washingtonian, Atlas Obscura, and Arlingt...