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杨正瓴 赞 +1
Google’s Project Loon high altitude balloons spotted over Virginia and Carolinas
Brent Watts  7/7/2020
https://www.msn.com/en-us/travel/news/google-e2-80-99s-project-loon-high-altitude-balloons-spotted-over-virginia-and-carolinas/ar-BB16q399
   
   Under just the right conditions, the high altitude balloons can be visible through a pair of binoculars when sunlight hits them just right as they float at around 50,000 feet. For perspective, most commercial aircraft fly between 30,000 and 38,000 feet — about 5.9 to 7.2 miles. A weather balloon typically reaches between 60,000 and 100,000 feet. These balloons fly in what is known as the Stratosphere. Most weather occurs in the layer below where the balloons fly called the Troposphere.
2021-05-17 21:33
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杨正瓴 赞 +1
50,000 feet
=

15240
05-17 21:35
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