How Far Are Satellites From Earth in Miles?

Satellites orbit Earth at distances ranging from roughly 100 miles to more than 22,000 miles, depending on their purpose. The closest ones skim just above the atmosphere at around 100 to 1,200 miles, while the farthest commonly used satellites sit in a fixed belt about 22,236 miles out. That range is enormous, and understanding which satellites sit where explains a lot about why your GPS works differently from your satellite TV and why the International Space Station looks like a bright dot streaking across the sky while a weather satellite appears to hover in place.

Low Earth Orbit, the Closest Zone

The vast majority of satellites circle Earth in what is called low Earth orbit, or LEO, which spans from about 100 miles up to roughly 1,200 miles. This zone hosts the International Space Station at about 250 miles, the Hubble Space Telescope at around 340 miles, and the massive Starlink internet constellation, most of which flies below roughly 370 miles. A study examining the Starlink constellation’s impact on the orbital environment found that the proposed fleet of around 12,000 satellites would dominate the region below 370 miles (600 km), making it the most crowded stretch of space around our planet.¹

One modeling study estimated that the entire LEO shell, stretching from about 124 to 559 miles (200 to 900 km), could theoretically hold around 12.6 million satellites before debris collisions become unmanageable, though we are nowhere close to that figure today.² In practice, most LEO satellites cluster in the lower portion of this band, below about 370 miles, because that altitude balances useful coverage with affordable launch costs.

Satellites in LEO complete one full trip around Earth in about 90 to 120 minutes, which means they pass over any given spot on the ground only briefly. That is why constellations like Starlink need thousands of satellites: no single one stays overhead long enough to provide continuous service. The tradeoff for being close is speed and coverage. You are near enough to keep signal delay extremely short, but you need many spacecraft to blanket the globe.

Medium Earth Orbit and the GPS Belt

Step further out and you reach medium Earth orbit (MEO), which spans roughly 1,200 miles to just under 22,000 miles. The most familiar residents of this zone are the GPS navigation satellites, which orbit at about 12,550 miles above the surface. At that altitude, each GPS satellite takes approximately 12 hours to circle the planet, meaning it passes over the same ground track twice a day. The U.S. GPS constellation uses about 31 active satellites to ensure that at least four are visible from virtually any point on Earth at any time.

Other navigation systems occupy similar altitudes. Europe’s Galileo satellites fly at about 14,430 miles, and Russia’s GLONASS constellation orbits at roughly 11,890 miles. These distances are a deliberate engineering choice: high enough that each satellite can “see” a large swath of Earth’s surface at once, but low enough that signal travel time stays short enough for precise positioning. A GPS signal still takes only about 67 milliseconds to travel from the satellite to your phone, which is fast enough that the system can pinpoint your location to within a few feet.

Some satellites in MEO follow highly elliptical orbits rather than circular ones. A Molniya orbit, for instance, swings from a low point of a few hundred miles to a high point of about 24,000 miles. Satellites in this type of orbit spend most of their time near the high point, lingering over high-latitude regions that geostationary satellites cannot cover well. These orbits have long been used for communications over polar areas.³

Geostationary Orbit at 22,236 Miles

The most distant commonly used orbit is geostationary Earth orbit, or GEO, at exactly 22,236 miles above the equator. A satellite at this altitude takes precisely 24 hours to orbit Earth, which means it matches the planet’s rotation and appears to hover motionless over one spot. This makes geostationary orbit ideal for weather monitoring, television broadcasting, and certain communications services, because a ground-based dish can point at the satellite once and never need to move.

GEO is a narrow ring directly above the equator. Every geostationary satellite shares the same altitude, and they are spaced along this ring like beads on a necklace, separated by just a few degrees of longitude to avoid signal interference. Because the ring is physically limited, orbital “slots” in GEO are a contested international resource managed by the International Telecommunication Union.

The downside of being 22,236 miles away is signal latency. A radio signal traveling at the speed of light takes about 240 milliseconds for a round trip between the ground and a GEO satellite. That quarter-second delay is barely noticeable for watching a broadcast, but it creates real problems for two-way conversations or fast-paced internet use. This latency penalty is the main reason newer broadband satellite networks like Starlink chose LEO instead of GEO.

Where Space Actually Begins

Before a satellite can orbit at any of these distances, it first has to get above the atmosphere. The question of where the atmosphere ends and space begins turns out to be less settled than most people assume. The commonly cited boundary is 62 miles (100 km) above sea level, often called the Kármán line. But research revisiting that boundary found that for a typical satellite, the effective Kármán line sits closer to 50 miles (80 km), and historical orbital data confirms that satellites can survive multiple passes at altitudes around 50 to 56 miles (80 to 90 km).⁴ That lower boundary is consistent with the 50-mile “astronaut wings” altitude the United States used during the early space program.

In practical terms, no satellite maintains a stable orbit at 50 or 62 miles because the atmosphere is still thick enough there to slow anything down within hours. The lowest stable orbits begin somewhere around 100 to 120 miles, and even those require periodic reboosting. This is why the ISS, orbiting at about 250 miles, fires its thrusters regularly to maintain altitude.

Why Altitude Determines What a Satellite Can Do

The distance a satellite flies from Earth is not arbitrary. It shapes almost every aspect of what the satellite is good at, from how sharply it can photograph the ground to how long its signals take to reach you.

For Earth-observation satellites, flying lower means seeing finer detail. One optical analysis showed that image resolution improved from about 4.3 feet per pixel at 155 miles (250 km) to about 7.5 feet per pixel at 404 miles (650 km), confirming a strong dependence of sharpness on altitude.⁵ The principle is straightforward: the closer you are to the ground, the more detail you can resolve with the same size lens. Research into very-low-Earth-orbit imaging payloads has found that lower altitudes allow smaller, lighter, and cheaper cameras to match the performance of much larger instruments flying higher.⁶

The catch is that lower orbits shorten a satellite’s natural lifespan because of atmospheric drag, and they limit how much ground the satellite can survey in a single pass. Higher orbits give broader coverage and longer lifetimes, but images become blurrier and signals take longer to arrive. Every satellite design is a balancing act between these tradeoffs.

Satellites Do Not Stay at a Fixed Distance

It is tempting to think of each satellite as locked at a fixed number of miles above Earth, but orbital altitude is always changing, especially in LEO. The thin wisps of atmosphere that extend hundreds of miles above the surface create drag that gradually slows satellites and pulls them closer to Earth. This process, called orbital decay, depends on the satellite’s altitude, its size relative to its mass, and how dense the upper atmosphere happens to be at the time.⁷

At higher LEO altitudes, around 500 to 600 miles, a satellite might survive for decades without any reboosting. At 250 miles, it could re-enter the atmosphere within months if left alone. That is why active satellites at low altitudes carry propulsion systems and periodically fire them to climb back up. When a satellite runs out of fuel or fails, it spirals down and eventually burns up.

Space weather adds another variable. Geomagnetic storms, caused by eruptions on the Sun slamming into Earth’s magnetic field, heat and puff up the upper atmosphere. This temporarily increases drag on LEO satellites. One study found that during a severe geomagnetic storm in 2003, the storm-driven orbital decay rate jumped by a factor of eight compared to quiet conditions.⁸ A comparative analysis of events in 2003 and 2024 calculated that for a satellite at roughly 250 miles (400 km), the daily decay rate rose from about 240 feet per day during quiet times to roughly 340 feet per day during the 2003 storm, and from about 509 feet per day to 846 feet per day during a 2024 event.⁹ Those differences in the 2024 figures partly reflect the fact that the Sun was near a solar maximum, when background atmospheric density is already elevated.

The practical consequence is that during intense solar activity, satellite operators may need to use extra fuel for altitude maintenance, potentially shortening mission lifetimes. In February 2022, SpaceX lost 38 newly launched Starlink satellites when a geomagnetic storm expanded the atmosphere enough that the low-flying satellites could not overcome the increased drag before reaching their operational orbits.

Beyond 22,236 Miles

While the overwhelming majority of satellites operate between LEO and GEO, some fly far beyond that 22,236-mile geostationary ring. Deep-space communication relays, scientific observatories, and, increasingly, satellites supporting lunar missions operate at distances that dwarf anything in traditional Earth orbit.

The growing interest in returning humans and robots to the Moon has created a need for satellites in cislunar space, the vast region between Earth and the Moon. Research into debris-tracking requirements for this region described conjunction assessment scenarios at about 62,000 miles from Earth’s center, roughly a quarter of the way to the Moon.¹⁰ The Moon itself orbits at an average of about 238,855 miles from Earth, and some spacecraft, like NASA’s CAPSTONE and the planned Lunar Gateway station, are being placed in special orbits around the Moon that keep them roughly that far away or in looping paths between the two bodies.

Even farther out, some satellites are parked at points where the gravitational pull of the Earth and the Sun roughly balance out. The James Webb Space Telescope, for instance, orbits about 930,000 miles from Earth at the second Lagrange point (L2). At that distance, it takes a signal about five seconds to travel one way. These extreme distances are useful for deep-space astronomy because they keep the spacecraft far from Earth’s heat and reflected light, but they also mean that if something breaks, no repair mission is coming.

A Quick Reference by Satellite Type

Because the range is so wide, it helps to connect specific types of satellites with their approximate distances:

• Space station (ISS): about 250 miles
• Earth imaging: 150 to 400 miles, with some very-low-orbit missions dipping below 150
• Starlink internet: roughly 210 to 370 miles
• Hubble Space Telescope: about 340 miles
• Iridium communications: about 485 miles
• GPS navigation: about 12,550 miles
• Galileo navigation: about 14,430 miles
• TV broadcast and weather (GEO): 22,236 miles
• James Webb Space Telescope: about 930,000 miles

The distances span more than three orders of magnitude, from a few hundred miles to nearly a million. Most of the satellites that affect daily life, including GPS, weather, and internet constellations, sit at either the near end or the far end of that range, with relatively little infrastructure in between.

Why LEO Keeps Getting More Crowded

The trend in the satellite industry over the past decade has been a dramatic shift toward LEO, driven by two forces: lower launch costs and demand for low-latency broadband. Launching to LEO requires far less energy than reaching MEO or GEO, and reusable rockets have slashed the cost per kilogram to orbit. At the same time, consumers and militaries alike want faster data links than GEO can physically provide because of the latency issue described earlier.

The result is a population explosion in the nearest orbital zone. Where a few thousand active satellites occupied all of space a decade ago, current counts put the number of tracked objects in LEO alone at over 10,000 active spacecraft and many more pieces of debris. Mega-constellations have fundamentally reshaped the landscape of that region.¹ This crowding has accelerated concerns about collisions and the long-term sustainability of these orbits, since every collision generates debris that threatens other satellites, potentially triggering a cascade.

For the average person wondering how far away satellites are, the honest answer is that the ones most likely to affect your daily life are surprisingly close. Your GPS signal comes from about 12,550 miles away, but the Starlink dish on your neighbor’s roof is talking to a spacecraft barely 340 miles overhead. That is closer than the drive from New York to Pittsburgh, just pointed straight up.