One of the most amazing endeavors humans have ever undertaken is the exploration of space. Millions of us dream of marveling at our blue and green marble of a planet from the depths of space. There are even those who will pay millions to do so.
More than 50 years ago, twelve astronauts walked on the Moon?s surface, about 386,000 kilometers from Earth. Since 2000, scientists have lived in a satellite popularly known as the International Space Station, performing various experiments.
Now the moon almost seems boring, and all eyes have instead turned to Mars, our nearest planet. The distance from Earth to Mars varies depending on our orbits around the sun, but the minimum distance is about 54.6 million kilometers. With our current technology, it takes about six to eight months to send a spaceship to Mars. We can get to the moon in three days.