It’s widely known as a gravitational slingshot, though most scientists refer to it as a gravitational assist, ... This catch-22 is described by what is called the rocket equation, ...

It could be that our equations of gravity are wrong, which would be interesting. It could be that measurements of spacecraft trajectory are wrong, too, which would be somewhat less exciting.

Two additional gravity assists from Earth are planned for 2026 and 2029. If Juice reaches Jupiter in 2031, its mission to study 35 of the gas giant's moons is expected to last until 2035 ...