Low Earth Orbit (LEO)

Low Earth Orbit is the busiest regime in spaceflight — the band of space just above the atmosphere where the ISS, most Earth-observation satellites, and the entire Starlink constellation operate. Orbits here complete in roughly 90 minutes and require the least delta-v from the surface, which is why almost every crewed mission since Gemini has flown here.

Common uses: crewed missions, ISS resupply, Earth observation, satellite constellations, space telescopes