What bothers me is I often read they are using the planet’s gravity to gain speed. Whatever speed an objet may gain while entering orbit should be lost when exiting it, right ?
So I guess it’s the cinetic energy of the planet that is actually fuelling the spacecraft, isn’t it ?
What bothers me is I often read they are using the planet’s gravity to gain speed. Whatever speed an objet may gain while entering orbit should be lost when exiting it, right ? So I guess it’s the cinetic energy of the planet that is actually fuelling the spacecraft, isn’t it ?