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Absolute magnitude - the actual brightness of a star.
Acceleration - the rate at which velocity changes; an object accelerates if its speed changes, if its direction changes, or if both its speed and its ddirection change.
Archimedes Principle - the principle that states that the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces.
Area - a measure of how much surface area an object has. Formula : Area = Length x Width
Asteroid - a small, rocky body that revolves around the sun.
Asteroid belt - the region of the solar system most asteroids occupy; roughly between the orbits of Mars and Jupiter.
Balanced Forces - forces on an object that cause the net force to be zero; balanced forces do not cause a change in motion or acceleration.
Black Hole - an object with more than three solar masses squeezed into a ball only 10km across whose gravity is so strong that not even light can escape.
Boyles Law - the law that states that for a fixed amount of gas at a constant temperature, the volume of a gas increases as its pressure decreases.
Buoyant Force - the upward force that fluids exert on all matter; buoyant force opposes gravitational force
Centripetal Acceleration - the acceleration that occurs in circular motion; an object traveling in a circle is constantly changing directions, so acceleration occurs continuously.
Charles's Law - the law that states that for a fixed amount of gas at a constant pressure, the volume of a gas increases as it's temperature increases.
Chemical Change - a change that occurs when one or more substances are changed into entirely new substances with different properties; cannot be reversed using physical means.
Comet - a small body of ice and rock that gives off gas and dust in the form of a tail as it passes close to the sun.