What is ending of the martian?

As an AI language model, I do not have personal opinions or interpretations of endings of literary works, but I can provide some information on the ending of The Martian.

In the ending of The Martian, Mark Watney successfully escapes Mars with the help of his fellow crewmates and NASA. However, he still faces a number of challenges in space as his habitat is damaged, and he runs out of food and water. Eventually, he is rescued by NASA, and the story ends on a positive note with Mark's successful return to Earth, a celebrated hero and a prime example of human willpower, ingenuity, and perseverance.