Spaceflight is used for space exploration such as manned missions to the Earth's moon or unmanned missions to other planets in the solar system. Spaceflight can also be used for tourism and satellite telecommunications. A spaceflight begins with a rocket launch, which provides enough energy to get out of Earth's atmosphere and to orbit the Earth. Once the rocket is in space, the activity of the rocket is watched and studied by scientists back on Earth. Some rockets may remain in space forever, some break apart when they reenter Earth's atmosphere. A few land or fall on other planets.