A meteoroid is a small rocky or metallic body in outer space. Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects. Objects smaller than this are classified as micrometeoroids or space dust. Most are fragments from comets or asteroids, whereas others are collision impact debris ejected from bodies such as the Moon or Mars. When a meteoroid, comet, or asteroid enters Earth's atmosphere at a speed typically in excess of 20 km/s, aerodyn
The Jeffersonian Republicans' first newspaper. Partisan politics spurred newspaper growth in the United States from 92 in 1790 to 329 at the end of Thomas Jefferson's presidency. All but 56 were identified with a political party.
Jefferson drew on ideas of Locke and other Enlightenment thinkers. He asserted that people had a number of natural rights, such as life, liberty and the pursuit of happiness. The American Revolution was important to people around the world, because it represented a fight for freedom, and because Americans carried out Enlightenment ideas.