A:Stargazers in ancient Greece observed the "pictures" formed by stars and named the Orion constellation after a mythological hunter. Many origin stories exist, but one popular version recounts Orion's quest to defeat a giant scorpion sent by Gaia, the goddess of Earth, according to the Windows to the Universe.
A:There is not much known about Mercury or its surface, except that it is similar to the moon in appearance and its composition consists of primarily molecular oxygen, sodium and hydrogen. There are also small amounts of helium and potassium. The planet does not have an actual atmosphere, which causes the planet to have extreme temperature changes during its rotation.
A:Scientists will never know the farthest star from Earth, as the star is so far away that its light has not, nor will ever, have enough time to reach Earth. Even the stars within the visible universe are far too numerous to count, but the farthest one that humans have ever detected is about 55 million light years away. This incredibly distant star is called SDSS J 122952.66 +112227.8.
A:A passenger airplane, flying at 600 mph, could circle the sun in just over six months. According to Space.com, the sun is a nearly perfect sphere, and there is essentially no difference in circumference at its equator and the circumference from pole to pole.
A:The general English definition of constellation is a group or configuration of objects, characteristics, ideas, feelings, etc, as in "a constellation of qualities." The noun constellation is used in astronomy, astrology and general English.
A:Living things are organisms that display the key characteristics of life. These characteristics include the ability to grow, reproduce, take in and use energy, excrete waste, respond to the environment, and possess an organized structure more complex than that of non-living things.
A:The end products of fermentation are alcohol, carbon dioxide and lactic acid. The process is essential in the production of beer, fermented milk and bread. To arrive at these end products, sugars are broken down in a process called glycolysis. During the process, huge amounts of hydrogen atoms are produced and deposited on pyruvic acid, the end product of glucose.
A:Carbohydrate chains are chains composed of two to potentially hundreds of carbohydrate compounds called monosaccharides. Once two of these monosaccharides combine, they form a disaccharide. If there are more than two but fewer than 10 monosaccharides in a chain, it is called an oligosaccharide, and a polysaccharide is a carbohydrate chain that consists of hundreds of monosaccharides.
A:The structure of RNA is a single-stranded molecule made up of basic units called nucleotides that contain a nitrogenous base, a five-carbon sugar and a phosphate group. Although there is only one strand of RNA, as opposed to the two stranded double helix of DNA, it does not always follow a linear pattern. Sometimes the molecules form loops and the nitrogenous bases bond.
A:Fungi are multicellular, eukaryotic organisms, while bacteria are single-celled prokaryotes. The cells of fungi have nuclei that contain the chromosomes and other organelles, such as mitochondria and ribosomes. Bacteria are much smaller than fungi, do not have nuclei or other organelles and cannot reproduce sexually.
A:Gaseous exchange occurs in the alveoli by simple diffusion. The blood flowing past the alveoli is rich in carbon dioxide and very poor in oxygen. The gas molecules naturally flow in the direction of lower concentration through the thin gas exchange membrane, which is only two cells thick.
A:The temperature at which wood combusts varies from 190 to 260 degrees Celsius. The ignition point of wood varies depending on the type of wood and the dryness of the wood. Decayed wood ignites at a temperature of 150 C.
A:Stainless steel is available in many different alloys that incorporate several different elements, but the essential components are iron, carbon and chromium. Low-carbon steel with at least 12-percent chromium forms an even layer of protective oxide on its surface and is, therefore, stainless.
A:Firefighters need a strong understanding of chemistry for personal and public safety, to enhance the effectiveness of their efforts and to prevent adding to the many hazards present during a fire. A firefighter uses his or her understanding of the chemistry of building materials and furnishings as well as the interaction of suppression chemicals with fire.
A:Stored kerosene can go bad. When kerosene is being stored, condensation can seep into the container and cause a problem. Sludge can develop from the mold and bacteria within the kerosene, and that causes it to break down.
A:Louis Pasteur was a scientist who developed important vaccines and came up with the process of pasteurization for foods. He is credited with discoveries that laid the foundation for the study of microbiology and modern medicine.
A:In chemistry, an indicator is defined as a substance that undergoes distinct observable change when the conditions of its solution change. Litmus is the most commonly used indicator in the laboratory.
A:When working with watercolors or similar types of dye or paint, mixing primary colors allows painters to create specific shades not included in the paint kit. Mixing blue and green paint together creates any shade of aqua desired.
A:Refraction is the change in a wave's direction when it encounters a change in its transmission medium. The process of refraction allows eyes and lenses to form images. When the wave's medium changes, the velocity of the wave changes, but its frequency remains the same.
A:Green and orange make brown. Per Color Matters, green and orange are both secondary colors, meaning that they are made by mixing two primary colors. Mixing any two secondary colors yields a brown shade, from muddy brown to olive brown.
A:There are nearly an infinite number of colors, according to the Chester F. Carlson Center for Imaging Science at the Rochester Institute of Technology. However, not all of them are distinguishable by the human eye.
A:Mixing Cadmium orange and Thalo blue together creates olive green. Adding more Cadmium orange gives the pigment a more olive green color, while adding more Thalo blue yields a bluish-green color. Another option is to blend yellow or ochre with ivory black or Payne's grey.