Aristarchus of Samos, the Heliocentric model, the Seven-Day Week, and the History of Planets
The definition of a planet has changed over the course of millennia, and during the last 100 years. In the 1820s, astronomers listed eleven planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, and Uranus (Neptune had not been discovered yet), plus Ceres, Vesta, Juno, and Pallas.
Dr. David Warmflash published this 21 months ago
+5 votes
Constellations; the Patterns of Stars in the Sky
The stars are those small and twinkling things that we usually see in the sky especially in a clear night. Stars me look like small but actually they are very large objects. Our sun is one of these stars which give heat and energy in the solar system where our planet Earth belongs.
varron104 published this 14 months ago
+2 votes
More articles >
