Space ships often can be termed as artificial satellites . There are two types of satellites when it comes to the use of nations and world. Satellites which are used for the exploration of other celestial bodies excluding earth is not included in these satellites . The satellites are termed as geostationary satellites and polar satellites . Geostationary satellites are those satellites which revolves through the latitudinal lines by maintaining same speed of the earth thus enabling the research of geographical areas and climate changes. Polar satellites are those satellites which revolves through longitudinal line or polar path. These satellites cover more area. To maintain a gravitational force inside the satellites, there are mainly 2 methods. The primary one is by creating a rotational force by rotating the capsule the secondary method is by constant acceleration. The second method is used more since it doesn't require a radius to rotate. Most of the time , inside the satellite the gravitational force is very low since it is far from the effective gravitational field of the earth.