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Loading contentThe satellites that watch the Earth, connect the world, and navigate the planet — connected through the Knowledge Graph to the agencies that operate them, the rockets that launched them, the launch sites they flew from, and the orbits they occupy.
Every individual satellite modelled in the encyclopedia, across all applications.
30 entriesMulti-satellite systems — from GPS and Galileo to Starlink and OneWeb.
11 entriesSatellites and constellations that relay voice, data, television, and internet.
8 entriesThe global navigation satellite systems — GPS, Galileo, GLONASS, and BeiDou.
4 entriesSatellites that image and measure the land, ocean, and atmosphere.
12 entriesGeostationary and polar-orbiting satellites that watch the Earth's weather.
5 entriesSatellites dedicated to studying the Earth system — gravity, ice, soil, and clouds.
6 entriesSpace-based observatories that study the sky rather than the Earth.
1 entriesPrivately-operated Earth-imaging and connectivity satellites and constellations.
3 entriesSatellites that pioneered new techniques — from solar power to solar sailing.
2 entriesSatellites currently operating in orbit.
17 entriesRetired satellites that shaped the space age.
13 entriesMilestone satellites that did something for the first time.
7 entriesSatellites and constellations in the busy low-Earth-orbit regime.
12 entriesSatellites in medium Earth orbit — home of the navigation constellations.
7 entriesSatellites parked over the equator, fixed above one point on the Earth.
4 entriesEarth-observation satellites in the constant-illumination sun-synchronous orbit.
14 entriesSatellites that pass near the poles to survey the whole rotating planet.
2 entriesWhere satellites fly, and why it matters.
The space agencies, civil bodies, and companies behind the satellites.
China's global navigation satellite system, using a mix of medium-Earth, geostationary, and inclined geosynchronous orbits.
A commercial low-Earth-orbit constellation delivering rapid-revisit, high-cadence Earth imagery.
Europe's civil global navigation satellite system — owned by the EU and operated through EUSPA, with ESA as the design and procurement agent — offering high-accuracy positioning independent of GPS.
A low-Earth-orbit satellite-phone and data constellation serving voice, messaging, and IoT connectivity.
Russia's global navigation satellite system, providing worldwide positioning and timing from medium Earth orbit.
The United States' global navigation satellite system, providing worldwide positioning, navigation, and timing from medium Earth orbit.
The second-generation Iridium constellation of 66 cross-linked low-Earth-orbit satellites providing pole-to-pole voice and data coverage.
SES's medium-Earth-orbit broadband constellation delivering low-latency connectivity to telecom, maritime, and enterprise customers between the tropics and beyond.
A low-Earth-orbit broadband constellation providing global connectivity, focused on enterprise, government, and maritime users.
Planet Labs' fleet of shoebox-sized Dove CubeSats that image the entire land surface of the Earth daily at medium resolution.
SpaceX's low-Earth-orbit broadband internet constellation, the largest ever built, delivering global high-speed connectivity.
Each satellite, constellation, orbit type, operator, and tracking network is a first-class knowledge-graph entity resolved through the Scientific Data Engine. Agencies, launch vehicles, and launch sites are the platform's existing, source-backed entities — reused, never duplicated. This encyclopedia performs no real-time tracking and states no live positions; where a satellite is observable, it links to the computed Live Sky tools. Unknown values are left blank. See source quality.