AR3S Tutorials SE1 PT1: What is space?

[AR3S_TGL]

So, you want to go to space huh? Well you've come to the right place. These tutorials should support the total beginner. So for a start, lets talk about space.

What you see above you is space. The reason we walk on the Earth (Home) Is because of something called gravity. Gravity was discovered by a guy named Isaac Newton. Gravity works like this:

The object with the most mass or a measure of how much matter is in an object, attracts the objects with less matter. Although, the objects require velocity to be able to have an orbit around an object, other wise they will just fall to it. So lets say we have the sun and the Earth. The Earth orbits the sun at 30km/s, which means that every second it moves 30kilometers. That's fast. Luckily, in KSP everything is scaled down. Kerbin or the Earth in this orbits at 9284.5m/s or around 9.3km/s. That is less than a 3rd of reality and a lot to play around with. So a 120km orbit around Kerbin is around 2km/s. This is what you want to achieve. But, you have to get high enough, so that takes about 2.5km/s of velocity, or we will refer to velocity needed as Δv or DeltaV. The explanation of this is that Delta means increase in and the V is Velocity. So it is the change in velocity. So how do we acquire this change in velocity then? We use rockets.