Teacher resources and professional development across the curriculum
Teacher professional development and classroom resources across the curriculum
Teacher Joe Reilly and scientist Britt Argow ask, "How can collisions cause planetary formation?" Dr. Scott Kenyon, senior scientist at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, explains how the various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and particles of dust left over after the Sun's formation. Animations help visualize how many collisions, over time, produce small objects that, in turn, accumulate more and more matter. As they grow large enough, they attract other objects gravitationally. Over the course of millions of years, a planet forms. Featured Scientists: Scott J. Kenyon, Ph.D., Ursula B. Marvin, Ph.D., and Sarah T. Stewart, Ph.D.
High School Standard D. Origin and Evolution of Earth System: The Sun, the Earth, and the rest of the solar system were formed from a nebular cloud of dust and gas 4.6 billion years ago. The early Earth was very different from the planet we live on today.