-
Under the geocentric model, the Sun, Moon, stars, and planets all orbited Earth. The geocentric model served as the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle and Ptolemy. Two observations supported the idea that Earth was the center of the Universe.
-
On the revolutions of the heavenly spheres, written by Polish astronomer Nicolaus Copernicus (1473–1543) and published just before his death, placed the sun at the center of the universe and argued that the Earth moved across the heavens as one of the planets.
-
Kepler's laws of planetary motion, in astronomy and classical physics, laws describing the motions of the planets in the solar system. Kepler himself never numbered these laws or specially distinguished them from his other discoveries.
-
The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope.
