The History of Artificial Satellites: From Sputnik to the Age of Connectivity

Newton left behind a curious thought experiment in his writings. Place a cannon on top of a high mountain and fire a cannonball horizontally — the landing point changes depending on the launch speed. If the speed is sufficient, the cannonball will keep falling along the curve of the Earth’s surface yet never touch the ground. The surface curves away as fast as the ball falls. The cannonball orbits the Earth and returns to its starting point.^[1]

This thought experiment was long considered nothing more than a physics textbook example. But exactly 270 years later, a metal sphere actually orbited the Earth, hurtling through space.

Rockets on Paper: The Theorists Came First

At the dawn of the twentieth century, the desire to reach beyond the atmosphere took root independently in three individuals. Remarkably, they barely knew of one another yet were looking in the same direction.

Russia’s Konstantin Tsiolkovsky laid the mathematical foundation for spaceflight almost entirely through self-study. Unable to receive a proper education due to deafness, he taught himself in libraries and published his 1903 paper “The Exploration of Cosmic Space by Means of Reaction Devices.” In it he presented an equation describing the relationship between a rocket’s velocity and fuel consumption — what is now known as the Tsiolkovsky rocket equation, the bedrock of all rocket design.^[2] Even more remarkable is that he had already written about the possibility of artificial satellites in 1895, sixty years before any object actually orbited the Earth.

Germany’s Hermann Oberth submitted a doctoral thesis on rockets to the University of Heidelberg in 1922 and was rejected — the topic was deemed “too absurd.” Undeterred, he published the material as a book in 1923, sparking a wave of rocketry clubs across Europe.^[3] Among his readers was Wernher von Braun, who would later design the V-2 rocket.

America’s Robert Goddard was the man who proved the theory with his own hands. On 16 March 1926, in Auburn, Massachusetts, he launched the world’s first liquid-fueled rocket. The flight lasted 2.5 seconds and reached a maximum altitude of just 12.5 meters.^[4] Yet this modest experiment changed the direction of human history.

Curiously, Goddard was ridiculed by the public at the time. In 1920 The New York Times mocked his work by claiming that “a vacuum offers no reaction.” The paper published a formal apology only on the eve of the Apollo 11 launch in 1969.^[4]

V-2: War Accelerates Technology

While the theorists were dreaming, war pulled rocket technology into reality far sooner than anyone expected.

In 1944, Nazi Germany deployed the V-2 rocket developed by Von Braun’s team. The V-2 was the world’s first ballistic missile. It reached altitudes of 80–90 kilometers, close to the boundary generally recognized as the edge of space.^[5] About 3,000 V-2s were fired at London and Antwerp, killing thousands of civilians.

When the war ended, the United States and the Soviet Union raced to claim V-2 technology and German engineers. Through Operation Paperclip, the United States brought hundreds of key engineers to America, including Von Braun.^[5] The Soviet Union secured parts and blueprints and began its own rocket program. Both pillars of satellite development — America’s NASA and the Soviet space program — grew from the same V-2 root.

Sputnik: A Beep That Changed the World

On the night of 4 October 1957, an R-7 rocket tore through the sky from a launch pad in Soviet Kazakhstan. Its payload was an aluminum sphere 58 centimeters in diameter, weighing 83.6 kilograms. It was Sputnik 1, humanity’s first artificial satellite.^[6]

Sputnik’s equipment was simple: just two radio transmitters. A “beep-beep-beep” signal rang out from Earth orbit for about 92 days. No music, no data — just a monotonous tone. Yet that simple signal shook the world.

America’s reaction bordered on panic. If the Soviet Union could place a satellite in orbit, it also had the ability to deliver a nuclear warhead to the American mainland by ballistic missile.^[6] Congress held emergency hearings, the press reported on “Sputnik Shock” extensively, calls for education reform arose, and federal funding for scientific research exploded.

What makes Sputnik particularly interesting is that the satellite posed no military threat in any meaningful sense. All it did was beep. Yet as a “proof of concept,” that beep shifted the balance of the Cold War.

Chief Soviet rocket designer Sergei Korolev launched Sputnik 2 just one month after Sputnik 1. This time it carried the dog Laika — a mission intended to prove that a living creature could survive in Earth orbit. With the technology of the time, return was impossible, and Laika died from overheating within hours of launch. This fact was not revealed publicly until decades later.^[7]

America’s Response: Explorer 1 and the Birth of NASA

Two months after Sputnik, in December 1957, the hastily assembled Vanguard rocket exploded two seconds after launch — in full view of the watching world. The image graced front pages under the mocking nickname “Flopnik.”^[8]

But on 31 January 1958, the United States successfully launched Explorer 1. Von Braun’s team had built it in just 84 days.^[8] Unlike Sputnik, this satellite carried scientific instruments to collect data. Physicist James Van Allen’s research team discovered a powerful radiation belt surrounding the Earth. This finding — the Van Allen belts — was the first scientific result produced by Explorer 1.^[8]

In July of the same year, President Dwight D. Eisenhower established NASA. The decision was to create a civilian space agency rather than a military one — a choice that would play an important role in shaping the character of space exploration for decades to come.

The Birth of Communication Satellites: A Telephone Exchange in the Sky

If Sputnik was a product of the Cold War, communication satellites were a product of commercial imagination.

In 1945, British science fiction writer Arthur C. Clarke published an intriguing proposal in a science journal. Place a satellite at an altitude of roughly 36,000 kilometers above the equator, he argued, and it would remain stationary above the same point, synchronized with Earth’s rotation.^[9] Seen from the ground, the satellite appears to hang motionless in the sky — which is why this orbit is today named after him as the “Clarke orbit,” or geostationary orbit.

Clarke’s idea was first realized in 1962 with Telstar 1. Telstar was not, in fact, a geostationary satellite. It traveled in an elliptical orbit, dipping below the horizon several times a day. But on 11 July 1962 — the day after launch — Telstar successfully relayed the first transatlantic television signal, from a ground station in Maine to one in Brittany, France.^[10]

The footage was broadcast live around the world, and for the first time people witnessed real-time video transmission across continents. Telstar’s rival was not technology but time: the satellite was visible from the ground for only a few hours each day.

The limitation was overcome by Intelsat 1, launched in 1965 and nicknamed “Early Bird.” It was the first commercial communication satellite in geostationary orbit, synchronized with Earth’s rotation.^[10] Early Bird provided 240 minutes of transatlantic telephone call capacity per day and became the foundation of international telecommunications.

Looking Down from Above: Weather Satellites and Spy Satellites

While communication satellites exchanged radio signals, other kinds of satellites were quietly watching the Earth from above.

On 1 April 1960, the United States launched TIROS-1, the world’s first weather satellite. Over its 2.5-month operational life, TIROS-1 transmitted 23,000 images of the Earth, of which 19,000 were used in meteorological analysis.^[11] Meteorologists, now able to observe cloud patterns comprehensively from above for the first time, could predict the development and movement of typhoons far more accurately.

If weather satellites were tools of open science, spy satellites were tools of secrecy. The American Corona program was a photographic reconnaissance satellite system that operated from 1959 to 1972. It photographed Soviet territory and returned the film canisters to Earth via parachute, where they were recovered mid-air.^[12]

What makes Corona compelling is the problem it solved. In 1957, fears of a “missile gap” — the belief that the Soviet Union had a commanding lead in missile capability — swept American society. Corona’s photographs showed this claim was exaggerated. A single Corona mission provided more intelligence than all previous U-2 spy plane missions combined.^[12] The satellite had silenced a strategic myth.

GPS: From Cold War Weapon to Everyday Tool

Today, when we navigate with our smartphones or a delivery driver receives real-time directions, it is all thanks to GPS. Yet GPS was originally a military technology developed to guide nuclear missiles accurately to their targets.

The direct predecessor of GPS was the Transit satellite navigation system, operated by the U.S. Navy in the 1960s. Its purpose was to allow submarines to pinpoint their exact location for nuclear missile launches.^[13] The Department of Defense then wanted a more precise and globally comprehensive system, and the NAVSTAR GPS program began in 1973. The first satellite was launched on 22 February 1978, and the complete 24-satellite navigation system was not fully operational until 1993.^[13]

Initially civilians were deliberately given a degraded, lower-accuracy signal — the military was unwilling to open precision navigation to the public. Then in 1983 a Soviet fighter jet shot down Korean Air Lines Flight 007, which had strayed into Soviet airspace after losing its way.^[13] That tragedy prompted President Ronald Reagan to declare that GPS would be made available to civilian aviation for safety purposes. In 2000, the intentional degradation of the civilian signal was lifted entirely.

Today GPS is not a single American system. Russia’s GLONASS, Europe’s Galileo, and China’s BeiDou each operate as independent satellite navigation systems. Geopolitical motives played a role: no single country should be able to monopolize the infrastructure.

Small Satellites and Mega-Constellations: A New Era Arrives

Until the 2000s, satellites followed a formula: large, expensive, and long in development. Building and launching a single satellite required hundreds of millions of dollars and years of effort. The technology that broke this formula was the CubeSat.

Built in standard 10×10×10-centimeter units, CubeSats are small and cheap enough for university research teams and startups to build. After Stanford University and California Polytechnic State University proposed the standard in 1999, hundreds of organizations went on to launch CubeSats.^[14]

Then SpaceX entered the picture. The Starlink program aims to deploy tens of thousands of small satellites in low Earth orbit to provide high-speed internet access anywhere in the world. Since the first launch in 2019, Starlink has grown rapidly; as of 2025, there are roughly 11,800 active satellites in Earth orbit, more than 7,000 of which are Starlink satellites.^[15] That represents approximately two-thirds of all currently operational satellites.

Space Debris: The Shadow Cast by Newton’s Cannonball

Here it is worth revisiting Newton’s thought experiment. An object in orbit, absent atmospheric drag, maintains that orbit indefinitely. Therein lies the problem.

In addition to operational satellites, Earth orbit is now crowded with the remnants of spent satellites, upper-stage rocket components, and collision fragments — hundreds of thousands of pieces of space debris. There are an estimated 600,000 objects between 1 and 10 centimeters across, and about 23,000 objects larger than 10 centimeters.^[15] A 1-centimeter fragment traveling at 28,000 kilometers per hour can deliver an impact far more powerful than a bullet.

In 1978, American scientist Donald Kessler put forward the hypothesis that if the density of debris in low Earth orbit exceeded a certain threshold, cascading collisions would amplify themselves and turn entire orbital shells into junkyards — a scenario known as the “Kessler syndrome.” Should this scenario come to pass, humanity would be unable to use Earth orbit at all for a prolonged period.^[16]

Large satellite constellations like Starlink make this risk more complex. SpaceX reported that in 2025 alone its Starlink satellites performed approximately 300,000 collision-avoidance maneuvers — an average of once every two minutes.^[15] The more satellites there are, the more objects must be avoided, creating a vicious cycle.

The international community is discussing regulations on space debris, but no legally binding agreement has yet been reached. Earth orbit remains a domain that belongs to no one in particular, and making rules for its use is at least as complicated as diplomacy back on Earth.

A Mirror Reflecting the Earth

Newton’s cannonball of 1687 was a pure thought experiment. The desire to actually realize it did not emerge until 270 years later — and the first to act on that desire was not science or exploration, but the arms race of the Cold War.

The outcome is striking. A technology born from the logic of war made weather forecasting possible and reduced the toll of natural disasters. A navigation system developed to guide nuclear missiles now directs children on their way to school. Eyes launched into space to watch enemies now record the retreat of glaciers and the loss of forests.

Newton’s cannonball was designed to orbit the Earth without falling. But what we have launched into the sky has done far more than orbit. It has become a mirror that reflects the Earth back to us.