If you project a large magnetic field the extra-solar ionized gas (intergalatic, between stars) can exert a fair amount of drag. A lot of people talk about bus

If you project a large magnetic field the extra-solar ionized gas (intergalatic, between stars) can exert a fair amount of drag. A lot of people talk about bussard collector (magnetic scope for hydrogen/helium) to power fusion. But instead of collecting gas use it as a drag chute.