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宇宙有多大?试图回答一个天文学的最复杂的问题
Science
How big is the universe? Attempting to answer one of astronomy’s most complex questions
The universe is a big place, but do we really know how big? Scientists think they do, and use an assortment of methods to figure it out. Here are our CliffNotes on the matter.
Digital Trends
电子被压缩成“一维”线,产生量子效应
Science
Electrons squeezed into 'one-dimensional' wires yield quantum effects
CAMBRIDGE, Mass., Sept. 15 (UPI) -- Scientists have witnessed quantum effects in electrons after squeezing them into "one-dimensional" wires. Researchers created so-called "quantum wires" out of the semiconducting material gallium arsenide. The wires were used to bridge the gaps between 6,000 narrow strips of metal. Scientists manipulated the magnetic field and voltage to narrow the available pathways across the bridges. When the scientists squeezed the electrons onto the quantum wire bridges, they created a traffic jam -- triggering a wave-like quantum effect. Researcher Christopher Ford likened this wave-like passage of subatomic information to the physics of an overcrowded trolley car. "If
UPI
一年前,科学家破解了爱因斯坦最伟大的谜团之一——现在,一种奇怪的新的天文学形式出现了
Science
A year ago Tuesday, scientists inside two giant L-shaped instruments saw a strange blip on their screens they could hardly believe. It was the first evidence of gravitational waves - ripples in the fabric of space that careen across the universe, right through everything and everyone. Einstein first predicted their existence 100 years ago, yet the famous scientist doubted we'd ever find any. However, scientists from the Laser Interferometer Gravitational-Wave Observatory (LIGO) experiment finally detected these cosmic reverberations on Sept. 14, 2015, thanks to the fearsome collision of two black holes about 1.3 billion light-years from Earth. They announced the discovery on Feb. 11, 2016, after
Business Insider
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