Orbital Mechanics Articles

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4/9/2026 • EN

A Three- and a Four- Body Problem

Analysis of Artemis I and Apollo 12 orbits, exploring three- and four-body gravitational problems in space missions.

Apollo Missions Chaos Theory Lagrange Points Orbital Mechanics Space Exploration

John D. Cook

4/2/2026 • EN

Artemis II, Apollo 8, and Apollo 13

Comparison of Artemis II mission trajectory with Apollo 8 and Apollo 13, highlighting lunar free-return and orbit details.

Apollo Program Artemis Mission Orbital Mechanics Space Exploration Trajectory Analysis

John D. Cook

2/2/2026 • EN

Satellites have a lot of room

A mathematical analysis reveals that despite crowded visuals, there is immense volume per satellite in Low Earth Orbit, suggesting space is less congested than it appears.

Collision Avoidance Low Earth Orbit Orbital Mechanics Satellites Space Technology

John D. Cook

Orbital Mechanics Articles

A Three- and a Four- Body Problem

Artemis II, Apollo 8, and Apollo 13

Satellites have a lot of room

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