Business
Lufthansa passengers faced massive travel disruption Wednesday as a strike led the German airline group to cancel almost all its flights from its domestic hubs in Frankfurt and Munich.
Jul 27, 2022
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20
Engineering
Russia is building a new ground-based laser facility for interfering with satellites orbiting overhead, according to a recent report in The Space Review. The basic idea would be to dazzle the optical sensors of other nations' ...
Jul 27, 2022
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Energy & Green Tech
Extreme heat waves and record temperatures are straining energy infrastructure nationwide, which is contributing to a global energy crisis, says Virginia Tech expert Saifur Rahman.
Jul 26, 2022
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5
Energy & Green Tech
As extreme heatwaves ravage the United States, Europe and Africa, killing thousands, scientists warn that the worst is still to come. With countries continuing to pump greenhouse gasses into the atmosphere and the chance ...
Jul 22, 2022
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54
Engineering
The UK's rail service has been hit with widespread train delays and high levels of cancelations during the heatwave. The whole of the east coast line between Edinburgh and London was closed for hours on July 20 because of ...
Jul 22, 2022
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12
Engineering
A study of different solar cooker designs has alighted on the optimal form and structure, which can be constructed or bought in the developing world. The most efficient available design meshes well with mathematical models ...
Jul 15, 2022
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Business
Airlines are recovering from huge COVID fallout but face fresh turbulence from rocketing inflation while airports battle to cope with booming demand.
Jul 15, 2022
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32
Engineering
Building construction and operation account for 16% and 22%, respectively, of total carbon emissions in China. Those numbers are down, but still need significant work to achieve green building construction and carbon neutrality, ...
Jul 7, 2022
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6
Business
Commercial aviation is critical to the global economy. In 2019, it supported more than 65 million jobs and had a global economic impact of US$2.7 trillion. The COVID-19 pandemic has been unlike any crisis, both in terms of ...
Jul 1, 2022
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Air Canada, the nation's largest carrier, announced Wednesday major flight cuts for this summer amid high demand, staffing shortages and numerous delays at the country's airports.
Jun 30, 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
