Alternative+Solar+Systems+and+Planets

=__Alternative Solar Systems and Planets (Mai)__= =__Kepler-20__:= =__Gliese 581 C:__= =__Future Plans and Expeditions__= =__What don't we know__= =__Source__=
 * There are millions and trillions of solar systems and planets outside of our solar system.
 * The following four planets are the examples of those orbiting around the sun called Kepler-20 and Gliese 581 C which have been discovered recently by NASA.
 * Has similar solar system as we have on Earth's.
 * Recently, scientists found out that there are similar looking, Earth-like planets orbiting around the Kepler-20.
 * The planets of Kepler-20 are organized in alternating size: large, small, large, small, large.
 * __Kepler-22b__ à Similar to the Earth but has extremely high surface temperature.
 * On Dec. 5, 2011, NASA announced the discovery of Kepler-22b in the habitable zone of its parent star.
 * It is likely to be too large to have a rocky surface.
 * Orbits its parent star every 290 days
 * The planet is about 2.4 times the size of Earth.
 * Its surface temperature is about 22℃.
 * Its atmosphere provides a greehouse effect.
 * __Kepler-20 e and Kepler-20f__ à Very similar looking, but they are very hot surface temperature
 * Kepler-20e
 * Slightly smaller than Venus, measuring 0.87 times the radius of Earth.
 * Orbits its parents star every 6.1 days
 * Its surface temperature is more than 1,400 degrees Fahrenheit
 * Kepler-20f
 * Kepler-20f is a bit larger than Earth, measuring 1.03 times its radius.
 * Orbits every 19.6 days
 * Its surface temperature is 800 degrees Fahrenheit, and is similar to an average day on the planet Mercury
 * Similarity
 * Both planets reside in a five-planet system called Kepler-20, approximately 1,000 light-years away in the constellation Lyra.
 * While Kepler-20e and Kepler-20f are Earth-size, they are too close to their parent star to have liquid water on the surface
 * Discoverd in April 24, 2007 by the team of Stéphane Udry University of Geneva's Observatory in Switzerland
 * The mass is at least 5.073 times that of Earth.
 * Located 15 times closer to its sun then Earth
 * One year on the planet is equal to 13 Earth days
 * Its sun is a red dwarf so that the planets can locate much closer to the sun and they also can be in their “habitable zones” which means that the planets are able to sustain water on their surface.
 * Atmosphere is denser than the Earth's.
 * The Kepler telescope found planets and studyed patterns of the planets rotating around the Kepler-20 and Gliese 581 C.
 * So far, the Kepler telescope found out that the planets in Kepler-20 are differs from ours by their features in alternate size.
 * Mythology
 * Some people believed that because some of the planets in Kepler 20 are belong to "habitable zones", those planets are likely to have life.
 * However, not many things have discovered yet
 * Scientific History
 * There are not much information about scientific history of Kepler 20 and Gliese 581 C.
 * Kepler telescope is still looking for the evidences that shows how the Kepler 20 has formed.
 * " Major Discovery: New Planet Could Harbor Water and Life | Space.com ." //Space and NASA News – Universe and Deep Space Information | Space.com //. N.p., n.d. Web. 29 Mar. 2012. .
 * "New Earth-like planet discovered outside our solar system." //nj.com //. N.p., n.d. Web. 30 Mar. 2012. 
 * "NASA Finds First Earth-Sized Planets Orbiting Star in Other Solar System | Video | TheBlaze.com ." //Breaking news and opinion on The Blaze //. N.p., n.d. Web. 29 Mar. 2012. .
 * "NASA Finds Smallest Earthlike Planet Outside Solar System." //National Geographic Daily News //. N.p., n.d. Web. 30 Mar. 2012. <news.nationalgeographic.com/news/2011/01/110110-nasa-kepler-10b-new-planet-found-rocky-science-space/>.
 * <span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">"NASA - NASA Discovers First Earth-size Planets Beyond Our Solar System." //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">NASA - Home //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">. N.p., n.d. Web. 29 Mar. 2012. <http://www.nasa.gov/mission_pages/kepler/news/kepler-20-system.html>.
 * <span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">"New planet discovered 2011: Nasa space telescope finds 'twin' of Earth, Kepler 20f | Mail Online." //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">Home | Mail Online //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">. N.p., n.d. Web. 29 Mar. 2012. <http://www.dailymail.co.uk/sciencetech/article-2076711/New-planet-discovered-2011-Nasa-space-telescope-finds-twin-Earth-Kepler-20f.html>.
 * <span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">" Two new planets are most Earth-like ever seen – but hot as hell | Science | The Guardian ." //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">Latest US news, world news, sport and comment from the Guardian | guardiannews.com | The Guardian //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">. N.p., n.d. Web. 29 Mar. 2012. <http://www.guardian.co.uk/science/2011/dec/20/planets-earth-like-exoplanet-solar-system>.
 * <span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">"16 'super-Earths' found outside solar system." //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">CNN //<span style="background-color: #efefef; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 11px;">. N.p., n.d. Web. 30 Mar. 2012. <www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=9&cts=1331707070732&ved=0CGAQFjAI&url=http%3A%2F%2Flightyears.blogs.cnn.com%2F2011%2F09%2F13%2F16-super-earths-found-outside-solar-system%2F&ei=0jpgT4W8B8e4iQfb7YXWBw&usg=AFQjCNFz-Wsi0fAkQCBKC4qR8fXJNvUTTg&sig2=fI5O