Definition

Noun: - (Spaceflight) A trajectory that passes close to a planetary body in order to gain energy from its gravitational field: A gravity-assist is a maneuver in which a spacecraft uses the gravity and orbital motion of a planet or moon to alter its own speed and direction without expending its own propellant.

Usage

• The term is used primarily in the context of space mission planning, orbital mechanics, and astrophysics.
• It describes a specific flight path and the resulting energy transfer.
• It is often discussed as a technique for enabling missions to the outer solar system.

Examples

• Noun:
  • The Voyager probes used a gravity-assist from Jupiter to reach Saturn.
  • Mission planners calculated a precise gravity-assist around Venus to slingshot the probe toward Mercury.
  • A well-executed gravity-assist can significantly increase a spacecraft's velocity relative to the Sun.

Advanced Usage

• "to perform/execute a gravity-assist": To successfully carry out the maneuver.
  • The spacecraft will perform a gravity-assist around Mars next month.
• "gravity-assist maneuver": A common compound term specifying the action (note: this is a compound term, not the target word alone).
  • The success of the mission depended on the complex gravity-assist maneuver.

Variants and Related Words

• Gravitational slingshot (n): A synonym for gravity-assist, emphasizing the "slingshot" effect on the spacecraft's path.
• Swing-by (n): Another synonym, often used interchangeably with gravity-assist.
• Flyby (n): A close pass by a celestial body. A gravity-assist is a specific type of flyby designed to change velocity.

Synonyms

• Gravitational slingshot
• Swing-by
• Powered flyby (when combined with a propulsive burn)

Related Phrases

• To gain a gravity assist: To utilize the maneuver to increase speed.
  • The probe will gain a gravity assist from the planet's gravity well.
• To use a planet for a gravity assist: To specify the celestial body involved.
  • The mission plan is to use Jupiter for a gravity assist.

Noun

1. (spaceflight) a trajectory that passes close to a planetary body in order to gain energy from its gravitational field