| A | B |
|---|
| antimatter | for every particle of matter there is an opposite or antiparticle with opposite properties; when matter and its antimatter meet they can annihilate each other, producing energy: examples: protons and antiprotons and quarks and antiquarks. |
| big bang theory | holds that the universe began 10 to 20 billion years ago under a state of tremendous temperatures and density, then exploded outward, marking the beginning of time, and has been cooling and expanding to its present state. |
| binary stars | two stars which move in elliptical orbits about their common center of mass. |
| black hole | a region in space from which light cannont escape a strong gravitational field; believed to form from the gravitational collapse of a massaive star. |
| chaos theory | states that simple nonlinear systems can behave in ways that are so complex that long-term predictability is impossible. |
| energy | the ablilty to do work. |
| friction | force that resists the movement of one object over another resulting in heat. |
| fuel | material that is burned to produce heat energy. |
| grand unified theory | mathmatical scheme in which the gravitational electromagnetic, weak, and strong nuclear forces are unified into a consistant description. |
| greenhouse effect | trapping and buliding up of heat in the atmosphere due to accumulationof CO2. |
