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Why do a baseball and a rocket need the same launch speed to get from Earth into space? It has to do with physics and gravitational force.
In planetary science, astronomers have found planets that orbit other stars, just like Earth orbits the Sun. Some of them might even be able to support life.
This backgrounder explains the difference between planets, dwarf planets and small solar system bodies, such as asteroids and comets.
Learn why we have seasons in this hands on activity.