Questions tagged [orbit-selection]

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Design of return trajectory from lunar polar orbit to Earth's atmosphere

Given a flight path angle, altitude and velocity at re-entry into the Earth's atmosphere, how do I go about designing the return trajectory from a polar orbit at 17km altitude about the lunar surface ...
2
votes
1answer
162 views

Ballistic missile typical trajectory - along which path is it supposed to travel between Russia, China and US?

Today I was puzzled when my son was holding a school globe asking me to show with my finger a trajectory of a (nuclear) ballistic missile flying from US to China and Russia and vice versa (from Russia ...
10
votes
5answers
3k views

Is there any reason to send space probes along the plane of our solar system instead of perpendicular to the plane of our solar system? [duplicate]

Is there any reason to send deep space probes (Pioneer and Voyager) along the plane of our solar system (maybe with a slight inclination) instead of perpendicular to the plane of our solar system? If ...
10
votes
1answer
937 views

What is the fewest number of satellites required to have constant global coverage?

How can I guarantee global coverage with the fewest number of satellites? Assume that link margin isn't a problem.