Gravity assist

High school (ages 12+)
Space & Astronomy

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/gravity-assist

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the first operational use?1959, Soviet Luna 3 probe, utilizing Earth's gravity
2. What is the primary benefit?Significant reduction in required propellant mass, enabling longer-duration and more distant missions
3. How does a gravity assist help a spacecraft travel faster?When the spacecraft approaches a planet from behind its orbit, it can ‘steal’ a little of the planet’s orbital speed. The planet’s gravity pulls the craft toward it, then the craft swings around and leaves with a higher velocity relative to the Sun. This gives the craft extra speed without using more fuel.
4. Why do planets give a tiny push to spacecraft?The planet’s mass is so huge that the tiny change in its speed is almost unnoticeable. The spacecraft gains energy, and the planet loses an almost immeasurable amount of momentum, so the planet’s motion stays almost the same.

Orbital Mechanics: The study of the motion of celestial bodies and spacecraft under the influence of gravity.
Hyperbolic Trajectory: An open path an object follows when it has enough energy to escape a gravitational field.
Sphere of Influence: The region around a celestial body where its gravitational pull dominates over other bodies.