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Questions tagged [free-return]

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Puzzler: Precisely what maximum distance from the Earth did the Apollo 13 astronauts achieve?

tl;dr: Both this answer and this answer quote Wikipedia to state that the Apollo 13 astronauts reached 404,171 km from Earth. I'm not able to reproduce that value. According to JPL's Horizons the ...
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1answer
479 views

How does Exploration Mission 1 orbit differ from Apollo-era free-return? How far from Earth (and Moon) does it go?

I'm having trouble understanding the current orbit planned for NASA's Space Launch System's Exploration Mission 1. Is it possible to explain how the planned orbit works and what the maximum distance ...
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Are there any free return trajectories for a manned Mars flyby mission between 2018 and 2024?

I am looking for a mission profile including the delta-v for burns for an interplanetary mission to Mars. I have been unable to find any free return trajectories between 2018 and 2024, are there any?
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1answer
293 views

Abort plan for Apollo 8

What was the plan if the flight controller received a no-go prior to Apollo 8's traverse of the far side of the Moon? How would they have returned to Earth without the gravity assist from the Moon?
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Could NASA send animals to Mars and back as a rehearsal before a human mission?

Animals in a "free return" trajectory around Mars and landed on Earth should give great data about the effects from microgravity and radiation. It would also test the life support systems. Wouldn't ...
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Does NASA ever plan crewed missions without a free return trajectory?

Because the mission was launched on a free return trajectory, the crew of Apollo 13 survived. Has that abort option ever been foregone in any mission that flew or was seriously planned? (A free ...