[lucidstack]

It's fascinating how brilliant this solution is. Let it slowly bounce on the comet, so that the rebounce velocity is very low, it doesn't affect the comet trajectory in any way, and they're collecting data during the slow descent. Nice.

[dandelany]

Rosetta couldn't really affect the comet trajectory in a meaningful way, even if we wanted to. The comet has a mass of nearly 10 trillion kg, the orbiter is <3000 kg, and P = MV. It would need to have insane velocity to impart any meaningful momentum.