Vivvo CMS 4.1 http://www.extrasolar-planets.com/ ©2007 Spoonlabs d.o.o. http://www.extrasolar-planets.com/files.php?file= http://www.extrasolar-planets.com/ http://www.extrasolar-planets.com/astronomy/black_holes.html Astronomy Sun, 22 Mar 2009 00:00:00 +0000 Black holes are objects so dense that not even light can escape their gravity and since nothing can travel faster than light, nothing can escape from inside a black hole. The expression black hole was coined by John Wheeler. http://www.extrasolar-planets.com/astronomy/brown_dwarfs.html Astronomy Sat, 21 Mar 2009 23:54:00 +0000 Brown dwarfs are the link between stars and planets and are not massive enough like stars on the main sequence and sometimes called as failed stars. As a result of their mass-poor they don't start the hydrogen fusion. But brown dwarfs heavier than 13 Jupiter masses do fuse deuterium. http://www.extrasolar-planets.com/astronomy/mars.html Astronomy Sat, 21 Mar 2009 21:20:00 +0000 The planet Mars is the last terrestrial planet and the fourth planet of our solar system. He is the most likely target for a manned space mission. Already the first ancient civilizations were fascinated by him and honoured Mars as a god (for Romans/Greeks were he the god of war). http://www.extrasolar-planets.com/astronomy/venus.html Astronomy Fri, 20 Mar 2009 19:41:00 +0000 Venus is the second planet from the sun and belongs to the terrestrial planets, sometime Venus is called Earth's sister planet, because both are very similar in size, mass and composition. Venus is named after the Roman goddess of love. http://www.extrasolar-planets.com/astronomy/white_dwarfs.html Astronomy Thu, 19 Mar 2009 23:57:00 +0000 White dwarfs develop when a star from maximum 1.4 solar masses dies. These stars are not heavy enough to generate the core temperatures required to fuse carbon in nucleosynthesis reactions and after they have become a red giant during their helium-burning phase, they will shed their outer layers to form a planetary nebula, leaving behind an inert core consisting mostly of carbon and oxygen. extrasolar-planets.com