Mercury is the closest planet to the sun. Its average distance from the sun is approximately fifty-eight million km and it’s diameter is 4875 km, making it the second smallest planet in our solar system. Its volume and mass are about 1/18 that of the earth and its average density is approximately equal to that…
Geocentric view: Earth-centered view. (600BC – 150 AD) Came from the belief that God created humans at center and everything moved in perfect divine circles. Earth was a sphere that remained motionless at center of the universe Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn orbited earth in circles Stars traveled around the earth on…
Stars begin their lives as clouds of dust and gas called nebulae. The gravity of a passing star or the shock wave from a nearby supernova may cause the nebula to contract. Matter in the gas cloud will begin to coalesce into a dense region called a protostar. As the protostar continues to condense, it heats…