One big problem with the article's proposal to steal momentum from Jupiter to move Earth to a larger orbit is that it is an energy absorbing process. In other

One big problem with the article's proposal to steal momentum from Jupiter to move Earth to a larger orbit is that it is an energy absorbing process. In other words, there has to be an external source of energy to move momentum from Jupiter to Earth. This is because the ratio of specific energy to specific momentum is higher for lower orbits than it is for higher orbits. In other words, the closer you are to the Sun, the more energy you get for a specific amount of momentum (because the gravity is stronger there). This is assuming near circular orbits. So, you can gain energy by moving momentum from Earth to Jupiter, but you lose it the other way. Another planet, such as Saturn, would be needed as an energy donor (moving momentum from Jupiter to Saturn, then using the excess energy to move momentum from Jupiter to Earth) to make the energy equation balance.