Ages ago the civilized world had started a mission to colonize the new world. The efforts were mostly taken on sea and many voyagers landed on new lands including the US. Many other countries were colonized with humans reaching nook and cranny of the world. And it is another story that most colonized nations got freedom with the passage of time. But humans’ desire to colonize other parts of the universe did not end.
With latest technology at hands, the advanced world eyed the space. The biggest breakthrough came in 1969 when US astronauts landed on moon. Since then many developments have taken place with US-space agency NASA leading from the front by monitoring the development on other planets.