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.
The most notable achievement of Jefferson's first term as President (1800) was the purchase in 1803 of Louisiana from France for 15 million dollars. (see Lewis and Clark). During his second term Jefferson encountered greater difficulties. One of the domestic problems was the Burr Conspiracy, with the former vice president Aaron Burr on trial for treason. Jefferson was succeeded as president in 1809 by James Madison. During the last 17 years of his life, Jefferson remained in Virginia. As the 'Sage of Monticello' he engaged in a rich correspondence with John Adams and others. Jefferson's last great public service was the founding of the University of Virginia in 1819.