Space X is a private company that uses research and technology in order to leave earth. With the technology and research SpaceX has developed, they have created different launches and spacecrafts. SpaceX started back in June 2002 by Elon Musk, him being the founder and CEO of the company. SpaceX goal was and is to allow people from earth to be able to not only visit other planets, but to also live at the planets. They do not use the idea of having people live in other planets for the simple fact that they do not know how to get humans back from going to other planets, because that is not the case. SpaceX and its technology has been able to send rockets out to space and return to earth. Making it the first and only private company to manage to accomplish that goal. SpaceX has come to an agreement with NASA for an amount of $440 million.
SpaceX have their actually ships that are designed and tested positive to launch and accomplish their goals. They also have test dummies called “pad Abort” which functions as an ejection seat that will detach from the actual dummy ship and release the “astronauts” in the “pad abort”.
When launching a rocket ship to space or another planet, SpaceX mentions a numerous of force that serve as a contribution to the departure and landing of their ships. Kinetic energy plays a huge role when it comes to landing and departing. Their ships are built with bases that are designed to help the ship land without burning from the fire or getting damaged due to the speed of the rocket after traveling. To make the their “Falcon 9”, to accelerate, they use a acceleration of 8,000 km/h because it has to pick up a “payload mass of 125 metric tons”. In order for SpaceX to make their ship depart from earth and land on another planet, they must use nitrogen attitude thrusters, which allow the ship to slow down and accomplish a U-turn so that the ship will land successfully.
Kinetic energy which in this case is measured in gigajoules, I believe joules is not enough for the amount spaceX needs in order to lift their ships.
This is the demonstration provided by SpaceX, which visually explains the method their ships take off from point and lands on point B. The picture above is not their actual ship, it is their test pad abort.
Of course, with gravity being a lot different out in space compared to what is used to on earth, SpaceX must be able to adjust to the change of force. being able to steer in a gravity that is a lot higher is a lot easier to do so, but to steer in a area such as near the moon where gravity is a lot smaller, not 0 because it is false to say gravity ends. Gravity just becomes at such a low point that it will make you move a lot faster than being on earth with a higher gravitational force.
Sources:
http://www.spacex.com/about
http://www.spacex.com/news/2015/12/21/background-tonights-launch
http://www.spacex.com/news/2015/05/04/5-things-know-about-spacexs-pad-abort-test