“I could go for another 100 days or 100 years,” the astronaut said during his last briefing with media from orbit. However he was a little stressed being isolated from people on the ground for a such long time. During his spatial mission he made many Earth observations. “There are parts of the Earth that are covered with pollution all the time. I saw weather that was unexpected. Storms bigger than we’ve seen in the past. This is a human effect. This is not a natural phenomenon,” he said. He also said that Earth’s atmosphere “looks very, very fragile” from the space station. The American cosmonaut also did experiments. Kelly will go now through a battery of physical and scientific tests to Houston’s Ellington Field. His experience in space will be helpful to prepare traveling to Mars in the future.