Ask mr Brain..all will be explained
When and where was the first newspaper published? VONDA Newsletters were circulated among government officials as early as the Tang dynasty (618-907 AD) in China. In Japan, there had been a long tradition of news publications called yomiuri -'sell and read' - which were sold by being read out loud in the streets.
In 15th century Europe, the finance house run by the Fuggers family in the German city of Augsburg produced an internal newsletter containing financial information of the day. The newsletter was well respected and known to outsiders as a valuable source of information.
But the first newsletter credited as being an actual newspaper was the Relation of Strasbourg, France, published in 1609 by Johann Carolus.
Why are planets round? The pull of gravity is mainly responsible for the round shape of the main planets in our solar system. But another powerful effect, centrifugal force, makes many planets bulge at their equators and keeps them from being perfectly round.
Our planets were formed about 4.7 billion years ago from a huge, spinning cloud of gas and dust. As this cloud whirled around the new sun, its debris began to stick together and formed lumpy balls of ice and dust. The balls were not perfectly round, said planetologist Dr Anthony Dobrovolskis of the National Aeronautics and Space Administration Ames Research Centre.
Once the balls reached about the size of our moon, they had accumulated enough mass to have substantial gravitational fields. This pull from within began to compress the planets' matter - whether solid or gas - into the most compact arrangement possible: a sphere.
But rotating bodies are affected by centrifugal force. This force causes the equator of a planet to be pulled outward slightly, and that in turn pulls the poles towards each other. The faster a planet spins, the more pronounced the effect.