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Name ___________________________________ Date ____________________ Class ______________________ Scale of the Universe: An Out-of-this-World Website A virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. Viruses are microscopic; they range in size from about 20 to 400 nm (nanometers) in diameter (1 nanometer = 10-9 meters). By contrast, the smallest bacteria are about 400 nm. To get a frame of reference for just how small viruses and bacteria are, we will use a website to compare them to other familiar items. Google “Scale of the Universe 2012”or go to http://htwins.net/scale2/. Click START. The scroll bar allows you to zoom in and out. Click on any image for more information, such as size in meters. This website was designed by twins Cary and Michael Huang when they were seventeen years olds. List items in order from SMALLEST to LARGEST: Items (size in meters) Largest virus Largest bacteria E. coli bacterium Red blood cell Paramecium Width of human hair Water molecule Human skin cell HIV (Human Immunodeficiency Virus) If you have time, record some fun facts you learned from this website: Peabody Fellows Explorers and Investigators. © 2013 Yale Peabody Museum of Natural History. All rights reserved.
