| A | B |
|---|
| astronomy | the study of planets, stars, and other heavenly bodies |
| Marco Polo | Italian merchant who spent 25 years traveling through Asia |
| Kublai Khan | the great leader of China who took Marco Polo under his wing |
| Henry the Navigator | Prince of Portugal, founded a school for sailors in 1418 |
| compass | a tool that shows the direction of magnetic north |
| caravel | a sailing vessel better suited for rough seas and long voyages |
| Bartholomeu Dias | a Portuguese explorer who rounded the southern tip of Africa |
| Vasco da Gama | a Portuguese explorer who sailed around Africa to Calicut, India |
| Calicut | a port in India |
| Christopher Columbus | A Spanish explorer who was looking for a western route to India and unknowingly found North America |
| Copernicus | a Polish astronomer who believe that the earth revolved around the sun |
| geocentric theory | the belief that the earth was the center of the universe |
| heliocentric theory | the idea that the sun was the center of the universe |
| Galileo | an Italian scientist who built a telescope and proved the heliocentric theory |
| telescope | an instrument that makes faraway objects appear closer |
| Isaac Newton | an English mathematician and scientist who discovered the law of gravity |
| gravity | a force that causes objects to be pulled toward the center of the earth |
