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1 dzień temu · Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving away from Earth. The velocity of the galaxies has been determined by their redshift, a shift of the light they emit toward the red end of the visible ...
1 dzień temu · In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time. In Albert Einstein 's 1905 treatment, the theory is presented as being based on just two postulates: [p 1] [1] [2] The laws of physics are invariant (identical) in all inertial frames of reference ...
1 dzień temu · Wi-Fi (/ ˈ w aɪ f aɪ /) is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves.These are the most widely used computer networks, used globally in home and small office networks to link devices and to provide ...
1 dzień temu · The layout of the Punic city-state Carthage, before its fall in 146 BC. Carthage was an ancient city in Northern Africa, on the eastern side of the Lake of Tunis in what is now Tunisia.Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the classical world.It became the capital city of the civilisation of Ancient Carthage and ...
1 dzień temu · The Shanghai maglev train (SMT) or Shanghai Transrapid (Chinese: 上海磁浮示范运营线; pinyin: Shànghǎi Cífú Shìfàn Yùnyíng Xiàn; lit. ' Shanghai Maglev Demonstration Operation Line ') is a magnetic levitation train (maglev) line that operates in Shanghai, China.The line uses the German Transrapid technology. The Shanghai maglev is the world's first commercial high-speed maglev ...
1 dzień temu · A cross section of the shore-end of a modern submarine communications cable. 1 – Polyethylene 2 – Mylar tape 3 – Stranded steel wires 4 – Aluminium water barrier 5 – Polycarbonate 6 – Copper or aluminium tube 7 – Petroleum jelly 8 – Optical fibers Submarine cables are laid using special cable layer ships, such as the modern René Descartes [], operated by Orange Marine.
1 dzień temu · Piper Alpha was an oil platform located in the North Sea about 120 miles (190 km) north-east of Aberdeen, Scotland.It was operated by Occidental Petroleum (Caledonia) Limited (OPCAL) and began production in December 1976, initially as an oil-only platform, but later converted to add gas production.. Piper Alpha exploded and collapsed under the effect of sustained gas jet fires in the night ...
