The most common way to become infected with giardia is after swallowing contaminated water. Giardia parasites are found in lakes, ponds, rivers and streams worldwide, as well as in municipal water supplies, wells, cisterns, swimming pools, water parks and spas.
Andreas Cellarius's illustration of the Copernican system, from the Harmonia Macrocosmica (1708). Heliocentrism, or heliocentricism, is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System. The word comes from the Greek (á¼¥Î»Î¹Î¿Ï helios sun and ÎºÎ­Î½ÏÏÎ¿Î½ kentron center).
Heliocentric Universe. A heliocentric universe is a universe in which the sun is the center and the planets orbit around it. Copernicus was the first person to formulate this idea. The idea of a heliocentric universe was rejected by the Church because God's prized creation, Earth, should be at the center. geocentric universe is the model of the universe created by Ptolemy, in which everything in the universe (sun, stars, other planets, etc.) orbits around the Earth.