Transcript Black Holes
BLACK HOLES By Kevin DICTIONARY MEANING Black Hole noun Astronomy . a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. MY TOPICS 1. What is Black Holes? 2. How do black holes form? 3. Why do some stars end up as black holes? 4. Can black holes grow ? 5. Could black holes be used as an energy source? WHAT IS BLACK HOLES? • Black hole is a very strong magnetic place that can suck up anything that goes pass even light. Back hole can also be described as a very big vacuum cleaner. It is also invisible. No one knows what the black hole looks like. There is also three types of black holes. HOW DO BLACK HOLES FORM? • When stars runs out of nuclear fuel it will collapse and exploded. This is how the black hole is formed. Massive type of black holes are produced by certain dying stars. A star with a mass greater than the Sun 20 times. WHY DO SOME STARS END UP AS BLACK HOLES? • However, when a star runs out of nuclear fuel and the star continues to lose energy from the surface when the star lose all the nuclear fuel then the gravity will win out over internal pressure and the star. It will die slowly or collapse quickly depending upon the structure of the star. However, if the star is more massive than the size of 3 to 5 suns it will most likely to become a black hole. The process of this can take up to billions of years. Stellar-massblack blackholes holes Stellar-mass Themost mostmassive massivestars starsend endtheir theirlives livesinintitanic titanic The explosions,leaving leavingnothing nothingbehind behindbut buttheir theirultraultraexplosions, densecollapsed collapsedcores. cores. dense Mid-massblack blackholes holes Mid-mass newclass classofofrecently-discovered recently-discoveredblack blackholes holes AAnew havemasses massesononthe theorder orderofofhundreds hundredsoror have thousandsofofstars. stars. thousands Supermassiveblack blackholes holes Supermassive Thecenters centersofofgalaxies galaxiescontain containgiant giantblack blackholes, holes, The withthe themasses massesofofmillions, millions,even evenbillions, billions,ofofstars. stars. with CAN BLACK HOLES GROW ? • Yes it can. Once a black hole has formed, it can continue to grow by absorbing energy and anything with mass. It keeps on growing and black hole can suck up the whole universe. The black hole will take many decade to form a super massive black hole. COULD BLACK HOLES BE USED AS AN ENERGY SOURCE? Brief a rotating black hole can store a huge amount of energy in its rotation. This energy is actually accessible since the rotation is imposed on the space outside the hole. In principle, therefore, energy can be extracted from the rotation of the black hole but it is impossible because the black hole will just suck you in. WEB http://blackholesplp.weebly.com BIBLIOGRAPHY http://upload.wikimedia.org/wikipedia/commons/d/d4/BlackHole.jpg http://www.spitzinc.com/pdfs/educ_guide_blackholes_nasa.pdf http://www.kidsastronomy.com/black_hole.htm http://www.phys.vt.edu/~jhs/faq/blackholes.html#q9 http://dictionary.reference.com/browse/black%20hole?fromAsk=tru e&o=100074 CORRECT !! WRONG !! THANK YOU FOR LISTENING