In sci.space.tech Mark Foskey wrote:
George Kinley wrote:

Are there any way for rockets to fly in space , other then throwing mass
out in one direction and moving in other


If they don't work that way, then we don't call them rockets.

One other possibility is a solar sail that uses the pressure of
sunlight, but such a sail would have very low thrust.


Strictly speaking, the solar sail too throws mass (photons) out in one
direction and moves in the other direction. Where the mass being thrown
out comes from is not too important.

--
Sander

+++ Out of cheese error +++