Astronaut tattoos are one of the most popular tattoo designs today. This could be due to the fact that they are quite unique and can be tailored to each individual's personal preference. They can be used to represent different aspects of a person's life. For instance, they can be used as a symbol of exploration, strength, and courage. Similarly, they can also be used to signify the power of the human spirit in overcoming any challenge that life throws our way.