Engineering
America's newest nuclear stealth bomber is making its public debut after years of secret development and as part of the Pentagon's answer to rising concerns over a future conflict with China.
Dec 2, 2022
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Software
Producing infection control clothing requires a lot of energy and uses lots of material resources. Fraunhofer researchers have now developed a technology which helps to save materials and energy when producing nonwovens. ...
Dec 1, 2022
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Business
Mexico's domestic airline industry is in shambles, plagued by safety problems, a ratings downgrade by the U.S. Federal Aviation Administration, and vandalism.
Nov 25, 2022
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Business
Lufthansa on Monday launched a drive to hire 20,000 employees, as the German airline giant recovers strongly from the coronavirus pandemic and seeks to tackle staffing shortages.
Nov 21, 2022
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Engineering
Pennsylvania drivers know the effects that weather can have on paved roads—potholes, cracks and other pavement woes are a common occurrence. Climate change is accelerating the process, with devastating consequences for ...
Nov 14, 2022
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Business
The Italian government on Tuesday approved injecting another 400 million euros ($400 million) into state-owned ITA Airways as efforts to sell off the airline stall.
Nov 8, 2022
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Business
Irish airline Ryanair flew back into a first-half profit Monday and forecast a strong outlook despite recession headwinds in Europe, as air travel rebounds after the lifting of COVID restrictions.
Nov 7, 2022
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Consumer & Gadgets
Heatwaves in numerous countries during 2022 sent all-time temperature records tumbling. On the day before the UK endured a shaded air temperature of 40°C for the first time ever, the Met Office issued its first ever red ...
Nov 3, 2022
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Energy & Green Tech
As part of its effort to reduce air pollution and cut greenhouse gas emissions that contribute to climate change, California is pursuing aggressive policies to promote clean trucks. The state already requires that by 2035, ...
Nov 2, 2022
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Security
Ukraine has received a broad array of military supplies from the U.S. and other allies. Recently, Ukrainian President Volodymyr Zelenskyy made an urgent plea specifically for additional air defense resources from the West ...
Oct 19, 2022
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The Earth's atmosphere is a layer of gases surrounding the planet Earth that is retained by the Earth's gravity. It has a mass of about five quadrillion metric tons. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night.
There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. An altitude of 120 km (75 mi) marks the boundary where atmospheric effects become noticeable during atmospheric reentry. The Kármán line, at 100 km (62 mi), is also frequently regarded as the boundary between atmosphere and outer space. Three quarters of the atmosphere's mass is within 11 km (6.8 mi; 36,000 ft) of the surface.
This text uses material from Wikipedia, licensed under CC BY-SA
