The Soviet Union’s launch of the world’s first artificial satellite in 1957 is best known for igniting the Space Age, a period of unprecedented scientific achievement and competition between the Soviets and United States that eventually led the U.S. to land a man on the moon. Sputnik, which means fellow traveler in Russian, circled Earth every 96 minutes, sending radio signals back to the planet strong enough to be detected by amateur radio operators.
The launch did more than start a technological battle for space supremacy. The satellite’s rocket body, which burned up two months after the October launch, is considered to be the first piece of man-made space debris. The satellite burned up on reentry in January 1958. That leftover hardware marked the beginning of a new age: “one in which humanity left more than just footprints in space,” the website Science News Today reported in May 2025.
Nearly 50,000 objects larger than 10 centimeters in diameter are being tracked as they orbit Earth. About 12,000 are active satellites. Scientists estimate that another 500,000 pieces between 1 and 10 centimeters are also in space, creating an international problem that affects the protection of satellites, space stations and even their crews. When debris smaller than 1 centimeter is considered, the number of objects floating in space is in the millions.
“From shattered satellite fragments to spent rocket stages, bolts, paint flecks, and tools accidentally released during spacewalks — Earth’s orbit is increasingly cluttered,” Science News Today said. “What was once a pristine frontier is now a chaotic, congested highway, threatening the safety of future missions, space stations, and even satellites essential to modern life.”
The launch of Sputnik, while scientifically groundbreaking, kick-started international efforts to track and remediate debris. The first effort was the creation of Project Space Track by the U.S. Air Force in 1957. Project Space Track was located at the Air Force Research Laboratory at Laurence G. Hanscom Field, now Hanscom Air Force Base, in Massachusetts. By 1960, researchers at the laboratory were using 150 sensors worldwide to track debris and make orbital predictions, according to NASA.
As space launches multiplied, a series of debris-related events sparked new programs. NASA, for example, created what is now the Orbital Debris Program Office in 1979 after reentries into Earth’s atmosphere by the Russian reconnaissance satellite Kosmos 954 in 1977 and the U.S. Skylab space station in 1979.
During the 1980s, the Air Force Space Debris Research Program was established as space debris continued to increase. The program started after multiple Delta rockets fragmented and following the U.S. test of an anti-satellite (ASAT) weapon.
In 1993, members of the space community founded an international forum — the Inter-Agency Space Debris Coordination Committee — which develops guidelines and coordinates efforts to address space debris. “The launch of Sputnik 1 in 1957 not only resulted in the creation of humanmade orbital debris — the first piece being the rocket stage that launched the artificial satellite and the second being the satellite itself — but also revealed the need to keep surveillance of these objects in space,” The Aerospace Corp., a U.S. nonprofit organization, wrote in a November 2022 retrospective.
Sputnik’s aftereffects also crystallized “academic curiosity and the need for intelligence gathering” that “continued to drive the United States in its desire to understand this new and unfamiliar frontier.” What’s more, it opened eyes to the military benefits of space sensors. “A network of early warning radars was established to watch the skies for potential incoming nuclear missiles,” The Aerospace Corp. wrote. “This surveillance system helped the military distinguish between objects in orbit that posed no threat and sub-orbital ballistic weapons that did.”
The launch of Sputnik 1 in 1957 not only resulted in the creation of humanmade orbital debris — the first piece being the rocket stage that launched the artificial satellite and the second being the satellite itself — but also revealed the need to keep surveillance of these objects in space. ~ The Aerospace Corp.
Additional initiatives tracked spacecraft that remained on orbit. These projects included the North American Air Defense Command’s (NORAD) Space Object Catalog. NORAD now stands for North American Aerospace Defense Command. Its catalog improved upon the foundation set by Project Space Track.
By the 1980s and ’90s, The Aerospace Corp. began to develop a breakup modeling code known as IMPACT and a collision hazard assessment tool called DEBRIS. The development of these capabilities made it possible for Aerospace to conduct the first nearly real-time risk analysis when a space shuttle flew through a debris cloud created by the breakup of a rocket that launched the Clementine spacecraft orbited by NASA and the Ballistic Missile Defense Organization.
Historically, breakups have been the largest contributors of fragmentary space debris, with ASAT tests among the largest single events. ASAT tests can lead to millions of lethal but nontrackable particles.
A rapid sequence of debris events in the late 2000s caused the U.S. government to raise questions about the risk that debris poses to spacecraft. Contributing to the need for debris remediation were events like the Chinese FY-1C ASAT test in 2007, which added more than 3,500 trackable pieces, and the 2009 Iridium 33 satellite collision with the Russian Cosmos 2251 satellite that created more than 2,300 pieces of debris.
It all started with a satellite named fellow traveler. In 2019, on the 62nd anniversary of Sputnik’s launch, writer Alexander William Salter wrote in The Hill magazine, “It was the dawn of a new era, inaugurating the space race and heralding revolutionary changes in technology, politics and society. But mankind’s trek to the stars had a pernicious side-effect: We started treating outer space like a junkyard.”