Wednesday , December 8 2021

Both satellites orbit the Earth there, why not collide?


64 satellites in & # 39; one mission.

That's what the spazjuna aerospace company SpaceX plans to launch the billionaire of & # 39; the Africa & # 39; South Ellon Musk Sunday, after several reprogramming.

It is a historical launch of the Falcon 9 rocket will take the largest number of & # 39; & # 39 satellites in, one mission ends of the earth & # 39; USA.

The 64 satellite launch cross Come from 34 different organizations from up to 17 different countries.

The devices have different sizes and will fulfill several functions, to improve communications with & # 39; the internet to carry pirates at sea.

But have you thought how many satellites in space? Can & # 39; send someone? And may coincide with & # 39; another?

How many satellites are there?

If you had to guess the number of & # 39; man-made satellites that are turning around the World, say what number? Hundreds, thousands?

According to Index & # 39; Items Placed in Space & # 39; Air, prepared by the United Nations Office for the Affairs & # 39; the Foreign Space (English, UNOOSA), there 4.921 orbiting satellite at present.

But not all are active.

"There are approximately 2,600 satellite m & # 39; longer working but still orbits, and a total of & # 39; about 17,000 & # 39; object & # 39; in space," explains David Barnhart, director of the Center of & # 39 ; Research on Space Engineering at the University & # 39; & # 39 in Southern California, Los Angeles. Angeles, USA.

The specialist refers to space debris orbit the Earth and in excess of 7,600 tons, according to the National Administration of Aeronautics and Space of the United States in February & # 39; this year. (NASA, for its acronym in English)

"All they orbits around the Earth from 100 km altitude (low orbit Earth) to 35,000 km (geostationary orbit)," Barnhart said to BBC World.

S & # 39; is the size of & # 39; satellite?

If you think & # 39; satellite, perhaps the first image that comes in & # 39; take for granted is that & # 39; large appliances made of & # 39; heavyweight material that weighs tons.

But not all are like that.

"Its size ranges from what one bread basket (Eg, tens of & # 39; centimeters on each side and some kilograms in weight) by school bus (Several meters on each side and thousands of & # 39 kilograms), "says Barnhart, which is dedicated to designing & # 39; satellites.

S & # 39; it is the & # 39; satellite function?

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

"The orbit & # 39; satellites around the Earth carries a large number of & # 39; functions including communications (Coverage & # 39; cell phone and data transfer), observation Earth, navigation and positioning (This is the GPS system we all use), and the study of space and the planet the science side", Describes the specialist.

As live satellite in orbit?

The satellites can orbitaw across the planet because they are programmed in & # 39; speeds that are fast enough to overcome gravity.

A rocket carries satellite in space and, once reached the determined position, place the satellite in its orbit.

The speed reached by satellite while separated from the rocket is enough to maintain the orbital hundreds of & # 39; years, Indicates the National Service & # 39; Satellite, Information and Environmental Information (Nesdis, for its acronym in English), depending on the Service National Oceanic and Atmosphere USA.

Satellite orbital remains & # 39; due to its speed and gravitational force that the Earth has it. The closest the World needs more speed to resist the force of gravity, the Nesdis explains on its website.

And the satellites carry their own supply of fuel to be used only in case of changing the orbit or to avoid collisions.

So can satellites collide?

"Yes, may be crashing, but it does not happen often. While it can & # 39; it seems that there are many satellites, space is "great", and generally put in & # 39; orbitri not sharing or interfere with & # 39; another, "says the specialist at the University & # 39; Southern California.

"This does not mean that it does not and can not happen, and with plans to install thousands of & # 39; other satellites, the probability of & # 39; possible collision will increase", he adds.

In February 2009, two satellite & # 39; communication, one American and one Russian, worked in space. It is believed that this was the first time that two satellites man accidentally ħabblu, describes the center & # 39; Nesdis.

Who controls the satellites?

The satellites can be owned & # 39; organizations, companies, governments and individuals.

There are many regulations to control the frequency of the radio communications work in orbit and f & # 39; which enter orbit, to avoid interference.

"According to the External Space Treaty (1967), each country has some sort of & # 39; regulatory control of satellite launches specifically to help avoid radio interference and prevent possible collisions during launch, "Barnhart said to BBC World.

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

If you do operations & # 39; & # 39 satellite; communications, will request a license from the Federal Communications Commission (FCC) or if you want to launch a space satellite, you need the permission of the Federal Aviation Administration (FAA).

And in & # 39; global terms, the United Nations Office for the Affairs & # 39; the Foreign Space (English, UNOOSA) is responsible for the implementation of UN policies related to & # 39; space, acts as a regulator of space law in the world.

Can & # 39; someone sends satellite space?

"Yes, today it is possible that almost anyone can & # 39; send satellites to space. Even high school students built and launched their own satellites to share programs with & # 39; launch vehicles and several government agencies around the world, "says Barnhart.

Commercial companies are launching satellites into space b & # 39; rate almost tripled in the last 10 years, b & # 39; investments amounting to billions of & # 39; dollars.

"It's a very exciting time in the space industry, b & # 39; many innovations, not only in & # 39; New sitelliti but in developing & # 39; for satellite industry & # 39; & # 39; service & # 39 ;, that there was no s & # 39; now ", Barnhart analyzes.

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