Can you travel to other star systems/galaxies through astral projection?

Yes

I don’t know but I do know nasa is still in business, so if anyone has done that they haven’t gotten the space program to believe them.

No one can. No one will ever. The Earth, heaven and hell is all there is.

No-one can do that yet.
But we all will when God time is right.
1 Corinthians 2:9
But as it is written: “ Eye has not seen, nor ear heard, nor have entered into the heart of man the things which God has prepared for those who love Him.”
The universe will be our playground.

I think we’ll be able to one day by an artificial form of astral travelling, kinda like the matrix machine in the matrix movie..

Yes you can, there is no reason why you can’t. Obviously most people would disagree considering most people are quite uneducated in OBEs. They haven’t studied OBEs, they haven’t read any books on the subject, they haven’t tried it themselves, they don’t even have the discipline nor the level of belief required for it to begin with. They will just assume whatever the hell they want too. They will come to their conclusions based on the very little knowledge they have about astral projection. Their minds have been conditioned into a very limited view of reality right from birth. Without even taking the subject of astral projection seriously they would rather dismiss it as bs because it doesn’t fit in with their current belief systems.
Of course it is possible, anyone can do it so long as they are willing to put in the time & effort required. Very little people seem to want to do that though. A free course on OBEs starts soon if you’re interested.
http://www.gnosticweb.com/dreams-and-obes-course