Humanity's orbital machines: the engineering behind artificial satellites

Space · Published 20 October 2026 Swipe more like this →

In short: While the Moon is a natural companion to Earth, humanity has built its own fleet of orbital neighbors. These man-made machines are not just floating objects; they are complex instruments designed to endure the harshest environments known to science to expand our reach into the cosmos.

Satellites are defined fundamentally as bodies that orbit around another body in space. While nature provides examples like the Moon orbiting Earth or Earth orbiting the Sun, artificial satellites are machines specifically constructed by engineers. These human-made objects, such as the Hubble Space Telescope and the International Space Station, vary significantly in shape and size, each equipped with specialized instruments to perform distinct functions in orbit.

The creation of an artificial satellite is a long-term engineering feat, often requiring months or even years of construction. Before launch, these machines must undergo rigorous testing to ensure they can survive the extreme physical stresses of a launch and the unforgiving conditions of the space environment. NASA, for instance, establishes specific missions first, then develops satellites tailored to meet those exact functional requirements.

Once in orbit, these satellites rely on Space Communications and Navigation (SCaN) to function. This system provides the vital channel for two-way data flow: sending commands to the spacecraft and receiving information back to Earth. This communication is facilitated by radio waves, which travel to antennas on the ground that capture and process the signals.

The data returned by these satellites is diverse and critical. It includes high-resolution scientific images, telemetry regarding the health of the satellite, and precise tracking of its location in space. Specific missions range from observing solar winds and the origins of the universe to monitoring Earth's atmosphere and exploring distant planets like Mars.

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