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High Earth Orbit (HEO)

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A high Earth orbit is a geocentric orbit with an apogee farther than that of the geosynchronous orbit, which is 35,786 km (22,236 mi) away from Earth.

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  • October 2025

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    Sun 19
    Oct 19
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Interstellar Boundary Explorer (IBEX) Begins Next Year in Space

    NASA spacecraft mapping boundary between the Solar System and interstellar space surpasses another full year in space; launched on this...
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Land Your Name + Message
on the Moon!

For a limited time you can send your name & message to the lunar surface on the Astrolab FLIP mission and the ILOA ILO-1 mission in 2026-2027.

ILO-1 will be mounted on the Astrolab FLEX rover lightbar, and operate on the Moon for 1+ years — broadcasting Space Calendar and messages back to Earth along with near real-time images of the celestial sky and the Moon, on a weekly basis.

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