Q20. What is Dark Matter ? It is believed by the scientists that 25% of the space is filled with dark matter. Dark matter does not emit any radiation or radio waves or violet rays, it is invisible, hence it called dark matter. The gaps between the different galaxies are filled with dark matter. Nothing more is known about the dark matter, scientists are working on to know what exactly the dark matter is. ( Because it is invisible, it is called dark matter.) Q21. Do you mean that the Universe is not expanding with an Uniform velocity? Yes ,it is not merely expanding , it is speeding up. In the beginning it was believed that the Universe was static, even Einstein believed it and then changed his view. Hubble indicated that the Universe is expanding, but the cosmologists in the beginning did not know that the Universe is not only expanding but also accelerating . ( Static = not expanding ) ( accelerating = the velocity is increasing ) In the universe there are more than 100 billion galaxies. Each galaxy has more than 100 billion stars. The entire universe is expanding. 1 billion = 100 crores. ( to contnue ) The Latest information : Deccan Herald Dated 11 June 2013 is as follows- The reason dark matter - which makes up 85 per cent of all the matter in the universe - is invisible could be because it possesses a rare, donut-shaped type of electromagnetism instead of the more exotic forces that have been proposed, according to a new study.
Posted on: Tue, 11 Jun 2013 13:10:40 +0000