Tuesday , April 20 2021

How many satellites are orbiting the earth and how is it possible that they do not hit?

64 satellites in a single mission.

Here's SpaceX Space Space Company's plans to launch in South African billionaire Ellon Musk on Sundays after several reprogramming.

It's an historic launch, since the Falcon 9 rocket will take the largest number of satellites into a single mission that takes away the US soil.

The 64 satellites that share a launching They come from 34 different organizations from up to 17 different countries.

The devices have different sizes and perform various functions, improving internet communication to pursue sea pirates.

But did you ask how many satellites are in space? Can anyone send them and can they hit each other?

How many satellites are there?


If you had to guess the number of man-made satellites that turn around the Earth, what number would you say? Hundred thousand

According to the Index of Objects Sent in Outer Space, prepared by the Office of the United Nations for Outer Space Issues (in English, UNOOSA), exists 4,921 orbiting satellites nowadays.

But not everyone is active.

"There are about 2,600 satellites that are no longer working but are still orbits, and about 17,000 objects in space, explains David Barnhart, director of the Space Engineering Center at the University of Southern California in Los Angeles. Angels, United States.

The specialist related to the space waste that orbits the ground and exceeds 7,600 tons, according to the National Aeronautics and Space Administration of the United States in February of this year. (NASA, for its abbreviation in English)

"All of them are in orbit around the Earth of 100km high (low ground orbit) to 35,000km (geostationary orbit)," Barnhart told BBC World.

What is the size of a satellite?


If you are thinking of a satellite, perhaps the first image that is considered is a great size, made of heavy material, which weighs tons.

But not everyone is so.

"His size varies the one bread basket (for example, tens of centimeters on each side and a few kilograms in weight) until school bus (several meters on each side and thousands of kilograms), "says Barnhart, who is dedicated to drawing satellites.

What is the satellite function?

Not all satellites are dedicated to observing the Earth and taking images.

"The orbit of satellites around the Earth fulfills many features that include communications (coverage of mobile phones and data transmission), I observe from Earth, navigation and investment (This is the GPS system that we all use), and The study of space and the planet on the part of science"describes the specialist.


How does satellite remain in orbit?

Satellites can orbit around the planet because they are planned at speeds that are fast enough to overcome importance.

Rocket carries the satellite into space and, when the given place reaches, puts the satellite into its orbit.

The speed reached by the satellite while it is separated from the rocket is enough to keep the device in orbit for a hundred years, notes the National Service of Satellite Satellites, Data and Information, (Nesdis, due to its abbreviation in English), which depends on the US National Service of Oceania and Atmosphere.

Satellite remains in orbit due to its speed and the gravity that Earth has on it. The closest to Earth requires more rapidity to resist the strength of gravity, explains the Nesdis on its website.

And satellites have their own fuel, which is used only to change the orbit or to avoid collisions.

So satellites can hit?


"Yes, they can crash, but it does not happen frequently. While there are many satellites, space is large, and usually placed in orbits that do not cross or interrupt each other, "says the specialist in the University of Southern California.

"That does not mean that this happens and can not happen, and with the plans to install a thousand more satellites, the probability of a possible shock will increase," he added.

In February 2009, two communication satellites, one American and one Russian, hit the space. It is believed that this was the first time that two human satellites accidentally hit, describing the Nesdis center.

Who controls the satellites?


Satellites can be owned by organizations, companies, governments and individuals.

There are many regulations to control the frequency with which radio communications work in orbit and in which orbit they enter to avoid interruption.

"According to the Outer Space Treaty (1967), each country has some regulated control of satellites in particular specifically to help prevent radio interference and prevent potential collision at launch," Barnhart told BBC World.

In the US, for example, private companies must obtain a federal license to operate in space.

If you want to carry out operations with satellite communications, you must request a license from the Federation of Communications Commission (FCC) or if you want to launch a satellite, you need the permission of the Federal Aviation Administration (FAA).

And in global terms, the United Nations Office for Outer Space Affairs (in English, UNOOSA) is responsible for implementing the UN's related policies to space, so that acts as a regulator of space law in the world.


Can anyone send satellite space?

"Yes, Today it is possible that almost someone can send satellites to space. Even high school students have built and launched their own satellites by sharing programs with launch vehicles and various government agencies around the world, "says Barnhart.

Business companies send satellites into space at a rate that has almost tripled over the last 10 years, with investments reaching billions of dollars.

"There is a very exciting time in the space industry, with many innovations, not only in new satellites but in the development "satellite" satellite industry, which has not existed until now, Analyze Barnhart.

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