How fast can you go (Space Travel)?

In space i hear there is no friction, nothing to slow you down. if you were able to maintain a stupied speed using all the forse you can muster in one craft would you in theory stay at that speed before you hit something. i also heard at present we are only able to get to speeds at 30,000mph. whats stopping anyone going faster in space?

according to Einstein the max speed is that of light, as u move faster and faster ur mass increases, it will become infinity at the speed of light, that is why u can't exceed it. Einstein proved it mathematically using thought expereiments

there is no law of physics that would keep you from endlessly approaching the speed of light, but you cannot reach it.
yes. if you are moving at a given speed and are not acted on by another force, you will continue at that speed.

The fastest man made object was the Helios 2 space probe which reached only 252,792 Kph (157,078 mph).

Space is not a perfect vacuum, and as such a limited amount of friction acts upon craft.

Also of more concern is the effects of gravity on the craft, the universal law of gravitation states that any two masses experience a attraction directly proportional to their masses and inversely proportional to the square of their distance.

However gravity can and does work to our advantage. We can intentionally send a craft into a large bodies gravity well causing it to accelerate toward the body and with a relatively low amount of fuel alter the trajectory to escape orbit. The accelerates the craft more efficiently than just using an engine and conserves fuel which really is the biggest limiting factor is speed.

You can only travel as fast as the thrust you generate out the back with rockets can achieve. The limitation, then, is the rocket engines.

What stops them is fuel. The fastest craft was the Apollo cpasule but that was the size of two phone booths to lower its mass. That went about 40,000 mph

more than 200,000000mt/sec