Gravity ['gră-və-tē]

A force which pulls two objects with mass toward each other.

All objects with mass, like the Earth, have gravity. Trees, water, animals, buildings, and the air we breathe are all held in place by the earth's gravity. Gravity works the same on all objects unless some kind of resistance, such as the atmosphere, gets in the way. Gravity exerts its force even at great distances — the sun's gravity affects the earth's orbit, and the moon's gravity affects earth's ocean tides.

Find out more about this topic by clicking on the buttons on this page. You can watch our broadcast show, Science Trek: The Web Show, and our video shorts in our player. Facts will tell you more about the topic. Links will expand your learning beyond our site. Glossary gives you a list of specialized words. Books offer reading suggestions. Games give you a chance to play. Top Ten are answers to ten of our favorite questions asked by students. Teachers provides materials for educators. Archive takes you to video files from past shows not on our current player. Contact us by clicking on the link in the masthead to email us questions or comments. Click for the current season’s schedule of programs, learn more about the scientists on this show and be sure to check out my blog.

Explore the site and explore your universe!