Lexicon

Glossary

The working vocabulary of spaceloading — spaceflight terms of art meeting data-infrastructure terms of art, defined for readers of both.

constellation infrastructure: A coordinated fleet of satellites operating as one system. The word does double duty: a satellite constellation and a compute cluster are the same metaphor at different altitudes.
crosslink link: A direct link between satellites, usually by laser, letting data travel through a constellation without touching the ground. The backbone that makes orbital networks more than isolated relays.
downlink link: The link carrying data from a spacecraft to the ground. Downlink capacity is the narrowest pipe in most spaceloading operations — results are only useful once they come back down.
downmass logistics: Capacity to return physical cargo from orbit. For data, the equivalent constraint is downlink; the occasional proposal to fly storage media home is downmass in the literal sense.
ground station infrastructure: The antenna facility where space links terminate on Earth. Every spaceload begins or ends at one, which makes ground-station scheduling a quiet chokepoint of the whole field.
Kármán line boundary: The conventional edge of space, 100 km up. This site's working definition: data that deliberately crosses it is being spaceloaded.
Kardashev scale framing: A ranking of civilizations by the energy they command; Type II harnesses its star's full output. Orbital compute is the first industry whose business case is a small, literal step in that direction — nearly continuous solar power.
latency (light lag) physics: The travel time of signals. Low Earth orbit adds milliseconds; the Moon adds about 1.3 seconds each way. Light lag decides which workloads can be spaceloaded interactively and which must run in batches.
LEO / GEO orbits: Low Earth orbit (roughly 200–2,000 km): close, fast-moving, low-latency — where compute constellations would live. Geostationary orbit (35,786 km): fixed overhead, ideal for broadcast, costly in latency.
orbital data center infrastructure: A satellite or platform whose payload is server hardware, powered by solar panels and cooled by radiators. The receiving end of compute-class spaceloading.
payload logistics: What a rocket carries — the aerospace word this site's headword is built on. A server rack in a fairing is payload on the way up and a spaceloading destination once it's flying.
radiation hardening (rad-hard) hardware: Designing electronics to survive cosmic rays and solar particles. Off-the-shelf chips flip bits in orbit; hardened ones cost more and trail the state of the art — a central tension of orbital compute.
single-event upset hardware: A bit flipped by one energetic particle passing through a chip. The reason spaceloaded systems lean on error correction, redundancy, and checkpointing more than their terrestrial twins.
station-keeping operations: The small, continuous maneuvers that hold a satellite in its assigned orbit. By extension: the ongoing maintenance that keeps any long-running system where it belongs.
sun-synchronous orbit orbits: A polar orbit that keeps a constant angle to the Sun; its dawn–dusk variant sits in near-perpetual sunlight. The prime real estate of orbital compute, because power there almost never sets.
thermal radiator hardware: The panels that reject heat to space — the only way to cool anything in vacuum. Radiator mass, not processor speed, is the honest limit on how much compute a satellite can carry.
uplink link: The link from ground to spacecraft. Precise engineering usage for one hop; the umbrella act it serves is spaceloading. See the disambiguation page.
upmass logistics: Launch capacity: how many kilograms can reach orbit, at what price. The physical bottleneck of the field — every spaceloading destination had to be upmass first.