Author Topic: How many satellites orbiting Earth?  (Read 2655 times)

stargazer

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How many satellites orbiting Earth?
« on: May 25, 2018, 12:53:49 PM »
How many satellites orbiting Earth?

Today I asked this question and I found answers. You may know about space debris and I assumed we have lots of metal in our orbit. I never dreamed we had that much.

We have nearly 20.000 satellites in orbit ! (Credit to AGI)

Here is the cool satellite viewer: http://apps.agi.com/SatelliteViewer/



There are estimated to be over 170 million pieces of debris smaller than 1 cm (0.39 in) as of July 2013. There are approximately 670,000 pieces from one to ten cm. The current count of large debris (defined as 10 cm across or larger) is 29,000. The technical measurement cutoff is c. 3 mm (0.12 in). Over 98 percent of the 1,900 tons of debris in low Earth orbit (as of 2002) was accounted for by about 1,500 objects, each over 100 kg (220 lb). Total mass is mostly constant despite addition of many smaller objects, since they reenter the atmosphere sooner. Using a 2008 figure of 8,500 known items, it is estimated at 5,500 t (12,100,000 lb). (Credit: NASA, ESA)

Maybe some of you know the intro for the film "Contact" ?



Satellites, cell towers, radio, these all create our enviroments here on Earth.
« Last Edit: May 26, 2018, 01:06:45 AM by stargazer »

petekelly

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Re: How many satellites orbiting Earth?
« Reply #1 on: May 27, 2018, 04:38:10 AM »
This is fascinating stuff Jana, I read somewhere that the incidences of solar activity are very much on the increase - in which case satellites (man made) may be very vulnerable. Food for thought...

stargazer

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Re: How many satellites orbiting Earth?
« Reply #2 on: May 27, 2018, 03:14:56 PM »
Yes Pete ! Thinking also of the effects sun activity and cell towers have on people and animals. I knew of a cat who lost hair on the side on which she used to sit at the window after they built a cell tower in the near of the house.