Find out how to become a pediatric oncologist. Research the education and training requirements, and learn about the experience you need to advance your career in pediatric oncology. View 10 Popular Schools Â».
Gravity's role is to keep the planets in orbit and balance.
Gravity, or gravitation, is a natural phenomenon by which all things with mass are brought toward one another, including objects ranging from atoms and photons, to planets and stars. Since energy and mass are equivalent, all forms of energy cause gravitation and are under the influence of it. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides. The gravitational attraction of the original gaseous matter present in the Universe caused it to begin coal